1. Apprendre
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  2. Cours
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  3. Intermediate Python
  • 1

    Matplotlib

    Gratuit

    Data visualization is a key skill for aspiring data scientists. Matplotlib makes it easy to create meaningful and insightful plots. In this chapter, you’ll learn how to build various types of plots, and customize them to be more visually appealing and interpretable.

  • 2

    Dictionaries & Pandas

    Learn about the dictionary, an alternative to the Python list, and the pandas DataFrame, the de facto standard to work with tabular data in Python. You will get hands-on practice with creating and manipulating datasets, and you’ll learn how to access the information you need from these data structures.

  • 3

    Logic, Control Flow and Filtering

    Boolean logic is the foundation of decision-making in Python programs. Learn about different comparison operators, how to combine them with Boolean operators, and how to use the Boolean outcomes in control structures. You'll also learn to filter data in pandas DataFrames using logic.

  • 4

    Loops

    There are several techniques you can use to repeatedly execute Python code. While loops are like repeated if statements, the for loop iterates over all kinds of data structures. Learn all about them in this chapter.

  • 5

    Case Study: Hacker Statistics

    This chapter will allow you to apply all the concepts you've learned in this course. You will use hacker statistics to calculate your chances of winning a bet. Use random number generators, loops, and Matplotlib to gain a competitive edge!

Initializing

Exercice

Add conditionals

The while loop that corrects the offset is a good start, but what if offset is negative? You can try to run the following code where offset is initialized to -6: 

# Initialize offset
offset = -6

# Code the while loop
while offset != 0 :
    print("correcting...")
    offset = offset - 1
    print(offset)

but your session will be disconnected. The while loop will never stop running, because offset will be further decreased on every run. offset != 0 will never become False and the while loop continues forever.

Fix things by putting an if-else statement inside the while loop. If your code is still taking too long to run, you probably made a mistake!

Instructions

100 XP
  • Inside the while loop, complete the if-else statement:
    • If offset is greater than zero, you should decrease offset by 1.
    • Else, you should increase offset by 1.
  • If you've coded things correctly, hitting Submit Answer should work this time.

If your code is still taking too long to run (or your session is expiring), you probably made a mistake. Check your code and make sure that the statement offset != 0 will eventually evaluate to FALSE!