Conditionals and their caveats¶

`==` and `is`¶

The rule of thumb to when to use == or is.

== is for value equality. Use to know if two objects have the same value.
is is for reference equality. Use to know if two references refer to the same object.

OR more compactly;

is - identity testing,
== - equality testing.

In [2]:

a = [1, 2, 3]
b = a
b is a 

Out[2]:

True

In [3]:

b == a

Out[3]:

True

In [4]:

b = a[:]
b is a

Out[4]:

False

In [5]:

b == a

Out[5]:

True

In [1]:

# Also and most annoyingly;
print([] is [])
print([] == []) 

False
True

The `while` statement¶

In [1]:

def funzo():
    contin = input("Are you having fun yet?(Y/N) ")
    while contin == "N":
        contin = input("I'm sorry! :( \n Are you having fun now? (Y/N) ")
    while contin == "Y":
        return "Good! I hope your happy now."

In [2]:

funzo()

Are you having fun yet?(Y/N) N
I'm sorry! :( 
 Are you having fun now? (Y/N) N
I'm sorry! :( 
 Are you having fun now? (Y/N) N
I'm sorry! :( 
 Are you having fun now? (Y/N) Y

Out[2]:

'Good! I hope your happy now.'

In [ ]:

Conditionals and their caveats¶

== and is¶

The while statement¶

`==` and `is`¶

The `while` statement¶