5 Iterations¶
Topics¶
- what is iteration/loop and why do we need it?
- types of loops and their syntaxes
- various keywords used with loops
- quick applications
5.1 Iterations / Loops¶
- iteratations are also called loops
- life is full of loops; everyday routines such as going to college, cooking food, slicing vegetables, etc.
- loops make computer repeatedly execute some block of code
- working with loop has prep work to start it and some condition to end it
- two types of loops: for and while
- some keywords that may appear in loops:
- for, while, break, continue, in, for ... else, while... else
Slice a carrot¶
- get cutting board
get knife
get a carrot
place carrot on cutting board
lift knife
advance carrot
slice carrot
if you see only your finger, then quit
else go to step 4
steps 4-8 form a loop!
steps 1-3 preparation
step 8 checks condition to end the loop
steps 4-7 are tasks that need to be iterated
5.2 for loop¶
- works with range of values
- syntax
for val in rangeofValues:
# loop body
- useful when you know exactly how many times the loop should be executed
- commonly used with built-in range( ) function
- typically, variables i, j, etc. are used as loop counters
In [1]:
# let's learn about range()
help(range)
Help on class range in module builtins: class range(object) | range(stop) -> range object | range(start, stop[, step]) -> range object | | Return an object that produces a sequence of integers from start (inclusive) | to stop (exclusive) by step. range(i, j) produces i, i+1, i+2, ..., j-1. | start defaults to 0, and stop is omitted! range(4) produces 0, 1, 2, 3. | These are exactly the valid indices for a list of 4 elements. | When step is given, it specifies the increment (or decrement). | | Methods defined here: | | __bool__(self, /) | self != 0 | | __contains__(self, key, /) | Return key in self. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(self, key, /) | Return self[key]. | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __ne__(self, value, /) | Return self!=value. | | __reduce__(...) | Helper for pickle. | | __repr__(self, /) | Return repr(self). | | __reversed__(...) | Return a reverse iterator. | | count(...) | rangeobject.count(value) -> integer -- return number of occurrences of value | | index(...) | rangeobject.index(value, [start, [stop]]) -> integer -- return index of value. | Raise ValueError if the value is not present. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | start | | step | | stop
In [2]:
# convert range into list of values
# learn about list in later chapter
list(range(10))
Out[2]:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
In [3]:
list(range(1, 11))
Out[3]:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
In [4]:
# let's provide a step of 2
list(range(1, 11, 2))
Out[4]:
[1, 3, 5, 7, 9]
In [5]:
# print hello world some number of times!
for i in range(1, 11):
print(i, 'hello world')
1 hello world 2 hello world 3 hello world 4 hello world 5 hello world 6 hello world 7 hello world 8 hello world 9 hello world 10 hello world
In [1]:
for num in range(20):
print(num)
print('done')
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 done
continue loop¶
- continue statement skips the rest of the current loop when continue is executed
In [7]:
# for loop example - continue
for i in range(1, 11): # range ... 1...10
if i%2 == 0:
continue
print(i)
1 3 5 7 9
Visualize with PythonTutor.com¶
break loop¶
- break statement is used to break a loop
- breaks or exits the loop immidiately
- rest of the current loop and other loops will not be executed!
In [8]:
# for loop example - break
for i in range(10):
if i == 10:
break
print(i)
print('done')
0 1 2 3 4 5 6 7 8 9 done
5.4 for ... else¶
- you can write an optional else statement with for loop
- the else clause executes when the loop completes normally
- this means that the loop did not encounter any break statement
In [5]:
for i in range(5):
if i == 2:
continue
print(i)
else:
print('end!')
0 1 3 4 end!
In [6]:
for i in range(5):
if i == 2:
break
print(i)
else:
print('end!')
0 1
In [11]:
# for... else example
# write a program to test whether a given number is prime
n = 97
#isPrime = True
for i in range(2, n//2+1):
if n%i == 0:
#isPrime = False
print(n, ' is not prime')
break
else:
print(n, 'is prime')
97 is prime
5.5 while loop¶
- while loop is used when you're not sure how many times the loop should be executed
- may execute 0 or many times!
- for loop and while loop can be used interchangeably
- syntax:
while condition:
# loop body
In [12]:
# infinite loop - will never stop
while True:
print('hello')
hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello 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hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello 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--------------------------------------------------------------------------- KeyboardInterrupt Traceback (most recent call last) <ipython-input-12-571ae571e299> in <module> 1 while True: ----> 2 print('hello') ~/anaconda3/lib/python3.7/site-packages/ipykernel/iostream.py in write(self, string) 398 is_child = (not self._is_master_process()) 399 # only touch the buffer in the IO thread to avoid races --> 400 self.pub_thread.schedule(lambda : self._buffer.write(string)) 401 if is_child: 402 # newlines imply flush in subprocesses ~/anaconda3/lib/python3.7/site-packages/ipykernel/iostream.py in schedule(self, f) 201 self._events.append(f) 202 # wake event thread (message content is ignored) --> 203 self._event_pipe.send(b'') 204 else: 205 f() ~/anaconda3/lib/python3.7/site-packages/zmq/sugar/socket.py in send(self, data, flags, copy, track, routing_id, group) 393 copy_threshold=self.copy_threshold) 394 data.group = group --> 395 return super(Socket, self).send(data, flags=flags, copy=copy, track=track) 396 397 def send_multipart(self, msg_parts, flags=0, copy=True, track=False, **kwargs): zmq/backend/cython/socket.pyx in zmq.backend.cython.socket.Socket.send() zmq/backend/cython/socket.pyx in zmq.backend.cython.socket.Socket.send() zmq/backend/cython/socket.pyx in zmq.backend.cython.socket._send_copy() ~/anaconda3/lib/python3.7/site-packages/zmq/backend/cython/checkrc.pxd in zmq.backend.cython.checkrc._check_rc() KeyboardInterrupt:
In [ ]:
i = 1
while i <= 5:
print(i, 'Hello World')
i += 1
In [7]:
# not sure when the user will get this correct...
# at least 1 try; could be more!!
while True:
number = input('Enter a whole number: ')
if not number.isdigit():
print('Not a valid number!')
continue
number = int(number)
break
Enter a whole number: 10
In [10]:
print(f'You entered {number}')
You entered 10
countdown¶
- run countdown as a script
- time.sleep(secs)
- os.system('clear'); os.name == 'posix', 'nt', 'mac', 'os2', 'ce', 'java', 'riscos'
In [13]:
# while loop - countdown
import time
import os
def clearScreen():
if os.name == 'nt':
os.system('cls')
else:
os.system('clear')
i = 10
while i >= 1:
print(i)
time.sleep(1) # sleep for 1 second
clearScreen()
i -= 1
#time.sleep(1)
print('Hapy new year!')
10 9 8 7 6 5 4 3 2 1 Hapy new year!
5.7 while... else¶
- optional else clause executes when the loop the loop executes normally
- this means that the loop didn't encounter any break statement
In [14]:
while True:
print('Hello')
break
else:
print("Look didn't encounter break")
Hello
In [15]:
count = 1
while count < 5:
print(count)
count += 1
else:
print("Look didn't encounter break")
1 2 3 4 Look didn't encounter break
5.8 Exercises¶
Exercise 1. Write a program to count the number of digits in a positive integer
In [16]:
n = 1234
print(len(str(n)))
4
Exercise 1.1. Convert Exercise 1 to a function and write at least two test cases.
In [17]:
def countDigits(number):
"""
given a positive number the function return number of digits
in the number
"""
pass
In [18]:
# test cases
def test_countDigits():
assert countDigits(10) == 2
assert countDigits(19923) == 5
assert countDigits(34324324327890) == 14
print('all test cases passed!')
Exercise 2. Write a program to count the number of digits 0 or 5 in a positive ingeger.
In [ ]:
# solution 1
# converst positive integer into string and parse one character at a time
n = 12345505
n = str(n)
count0 = 0
count5 = 0
for c in n:
if c == '0':
count0 += 1
elif c == '5':
count5 += 1
print('There are {} zero(s) and {} five(s) digits in {}.'.format(count0, count5, n))
In [19]:
# solution 2
# repeated divide the positive integer by 10 counting the value of remainder until the number is greater than 0
n = 12345505
savedN = n
count0 = 0
count5 = 0
while n > 0:
n, rem = divmod(n, 10)
if rem == 0:
count0 += 1
elif rem == 5:
count5 += 1
print('There are {} zero(s) and {} five(s) digits in {}.'.format(count0, count5, savedN))
1 2 3 4 5 0
Exercise 2.1. Convert Exercise 2 to a function and write at least 2 test cases
Exercise 3. FizzBuzz program - Write a program that prints numbers between 1 and 100 with the following requirements. If the number is divisible by 3, print 'Fizz'. If the number is divisible by 5, print 'Buzz'. If the number is divisible by both 3 and 5, print 'FizzBuzz'.
Exercise 3.1. Convert Exercise 3 into a function and write at least 2 three test cases.
Exercise 4. What are the output(s) of the following code snippets?
In [ ]:
a = 11
while a < 10:
print(a)
a += 1
#break
else:
print('Done')
In [ ]:
for i in range(1, 10):
if i == 5:
break
print(i)
else:
print('done')
In [ ]:
for c in 'hello':
print(c, end=' ')
Kattis problems¶
- almost every problem involves some form of loops!
In [ ]: