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Python FTW: Under the Hood

Modifying the Dictionary While Iterating Over It

Explore the challenges and risks involved when modifying a dictionary while iterating over it in Python. Understand the underlying behavior of dictionary resizing and how different Python versions handle this operation, helping you write more reliable and error-free code.

We'll cover the following...

Where does Christmas come before Thanksgiving?

⚠️ The following code is meant for Python 2.7 - 3.5 versions.

Python 3.5
x = {0: None}
for i in x:
    del x[i]
    x[i+1] = None
    print(i)

The code runs exactly eight times, ...



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