Python Tips I Wish I Knew Earlier#

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# The old way
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numbers = []
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for i in range(10):
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    numbers.append(i * 2)

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# The Pythonic way
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numbers = [i * 2 for i in range(10)]

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name = "LUKKID"
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years = 3
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# Old way
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print("Hi, I'm {} with {} years exp".format(name, years))
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# New way (Python 3.6+)
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print(f"Hi, I'm {name} with {years} years exp")

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fruits = ['apple', 'banana', 'orange']
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# Don't do this
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for i in range(len(fruits)):
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    print(i, fruits[i])
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# Do this instead
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for i, fruit in enumerate(fruits):
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    print(i, fruit)

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user = {'name': 'LUKKID'}
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# This might crash
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# age = user['age']  # KeyError!
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# This is safe
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age = user.get('age', 'Unknown')  # Returns 'Unknown'

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# Always use 'with' for files
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with open('data.txt', 'r') as file:
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    content = file.read()
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# File automatically closes!