#!/usr/bin/env python
# coding: utf-8

# #### Before you start working on these exercises, make sure you've watched the videos, done the reading, and taken the quiz!
# 
# General Resources:
# * [Main PY4E Website](https://www.py4e.com)
# * [Full Textbook PDF](http://do1.dr-chuck.com/pythonlearn/EN_us/pythonlearn.pdf)
# * [Full Youtube Playlist](https://www.youtube.com/playlist?list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p)
# 
# Lesson 4 Resources:
# * [Lesson Page](https://www.py4e.com/lessons/functions)
# * [Video 4.1](https://www.youtube.com/watch?v=5Kzw-0-DQAk&list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p&index=19)
# * [Video 4.2](https://www.youtube.com/watch?v=AJVNYRqn8kM&list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p&index=20)
# * [Lesson Slides](https://www.py4e.com/lectures3/Pythonlearn-04-Functions.pptx)
# * [Textbook Chapter 4](https://www.py4e.com/html3/04-functions)
# * [Link to Quiz (must be logged in)](https://www.py4e.com/lessons_launch/py4e_04_def_quiz)
# * If you're feeling stuck on exercise 4.6, worked solutions are available on the lesson page and Youtube

# In[ ]:


# Make sure to run this cell to load the autograder!
from grader import check_exercise


# **Exercise 1: Run the program on your system and see what numbers you get.
# Run the program more than once and see what numbers you get.**

# In[ ]:


### Run This Code ###
import random

for i in range(10):
    x = random.random()
    print(x)

Answer: The result of this program was ...
# **Exercise 2: Move the last line of this program to the top, so the
# function call appears before the definitions. Run the program and see
# what error message you get.**

# In[ ]:


### Run This Code ###
repeat_lyrics()

def print_lyrics():
    print("I'm a lumberjack, and I'm okay.")
    print('I sleep all night and I work all day.')

def repeat_lyrics():
    print_lyrics()
    print_lyrics()

Answer: The result of this program was ...
# **Exercise 3: Move the function call back to the bottom and move the
# definition of `print_lyrics` after the definition of `repeat_lyrics`.
# What happens when you run this program?**

# In[ ]:


repeat_lyrics = None # Resets functions for Exercise 3
print_lyrics = None # Resets functions for Exercise 3

### Run This Code ###

def repeat_lyrics():
    print_lyrics()
    print_lyrics()

def print_lyrics():
    print("I'm a lumberjack, and I'm okay.")
    print('I sleep all night and I work all day.')

repeat_lyrics()

Answer: The result of this program was ...
# **Exercise 4: What is the purpose of the "def" keyword in Python?**
# 
# a\) It is slang that means "the following code is really cool"\
# b) It indicates the start of a function\
# c) It indicates that the following indented section of code is to be
# stored for later\
# d) b and c are both true\
# e) None of the above

# In[ ]:


exercise = 'Exercise 4.4'

### Begin Answer Here ###
answer = 
###  End Answer Here  ###

print(repr(answer))


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# Make sure to save your notebook before checking!
check_exercise('Exercise 4.4')


# **Exercise 5: What will the following Python program print out?**
# 
# ~~~~ {.python}
# def fred():
#    print("Zap")
# 
# def jane():
#    print("ABC")
# 
# jane()
# fred()
# jane()
# ~~~~
# 
# a\) Zap ABC jane fred jane\
# b) Zap ABC Zap\
# c) ABC Zap jane\
# d) ABC Zap ABC\
# e) Zap Zap Zap

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exercise = 'Exercise 4.5'

### Begin Answer Here ###
answer = 
###  End Answer Here  ###

print(repr(answer))


# In[ ]:


# Make sure to save your notebook before checking!
check_exercise('Exercise 4.5')


# **Exercise 6: Rewrite your pay computation with time-and-a-half for
# overtime and create a function called `computepay` which
# takes two parameters (`hours` and `rate`), and returns a float.**
# 
# ~~~~
# Enter Hours: 45
# Enter Rate: 10
# Pay: 475.0
# ~~~~

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exercise = 'Exercise 4.6'

### Start Code Here ###
    
###  End Code Here  ###


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# Make sure to save your notebook before checking!
check_exercise('Exercise 4.6')


# **Exercise 7: Rewrite the grade program from the previous chapter using a
# function called `computegrade` that takes a score as its
# parameter and returns a grade as a string.**
# 
# ~~~~
#  Score   Grade
# >= 0.9     A
# >= 0.8     B
# >= 0.7     C
# >= 0.6     D
#  < 0.6     F
# ~~~~
# 
# ~~~~
# Enter score: 0.95
# A
# ~~~~
# 
# ~~~~
# Enter score: perfect
# Bad score
# ~~~~
# 
# ~~~~
# Enter score: 10.0
# Bad score
# ~~~~
# 
# ~~~~
# Enter score: 0.75
# C
# ~~~~
# 
# ~~~~
# Enter score: 0.5
# F
# ~~~~
# 
# Run the program repeatedly to test the various different values for
# input.

# In[ ]:


exercise = 'Exercise 4.7'

### Start Code Here ###

###  End Code Here  ###


# In[ ]:


# Make sure to save your notebook before checking!
check_exercise('Exercise 4.7')