Python Reference

🖨️

print()

Output text or values to the console or file.

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📏

len()

Return the number of items in any sequence. O(1).

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🔢

range()

Generate a lazy sequence of integers for loops.

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⌨️

input()

Read a line of text from the user. Always returns str.

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➕

append()

Add one item to the end. Mutates in place, returns None.

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📚

extend()

Add multiple items to the end from any iterable.

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📍

insert()

Insert an item at a specific index. O(n).

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✂️

split()

Break a string into a list. Default splits on whitespace.

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🔗

join()

Join an iterable of strings with a separator. Reverse of split.

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🧹

strip()

Remove leading and trailing whitespace or custom characters.

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📝

format()

Format strings with placeholders and alignment.

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🔁

replace()

Return a copy with substring replacements applied.

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🔑

keys()

Return a view of all keys in a dict. Iterable and dynamic.

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📦

items()

Return (key, value) pairs as a view. Ideal for loops.

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💎

values()

Return a view of all values in a dict.

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