intermediatePython Framework • Core Concepts

Pythonic Practices

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Replace clunky loops with elegant one-liners. List comprehensions are faster and easier to read.


Python
# Old way
squares = []
for i in range(10):
    squares.append(i*i)

# Pythonic way
squares = [i*i for i in range(10)]

Never forget to close a file or release a lock again. The `with` statement handles setup and teardown automatically.


Python
# Old way
f = open('file.txt')
data = f.read()
f.close()  # Easy to forget!

# Pythonic way
with open('file.txt') as f:
    data = f.read()

Stop using `range(len(items))`. Use `enumerate()` to get indices and items. Use `zip()` to loop over two lists at once.


Python
names = ['Alice', 'Bob']
scores = [100, 90]

for i, (name, score) in enumerate(zip(names, scores)):
    print(f"{i+1}. {name}: {score}")

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