sequence_cheatsheet.md

Common sequence operations with examples

len

:::python
len('abc')  # -> 3

len([1, 5, 2, 3])  # -> 4

in / not in

:::python
1 in [2, 1, 3]  # -> True

'a' in 'hello world'  # -> False

'a' not in 'hello world'  # -> True

Slicing

:::python
s = 'hello world'

# slicing (inclusive start, exclusive end)
s[1:4]  # -> 'ell'

# from start to index
s[:4]  # -> 'hell'

# from index to end
s[3:]  # -> 'lo world'

# can use negative indexes as well
s[2:-2]  # -> 'llo wor'

# jumps
s[::2]  # -> 'hlowrd'
s[1::2]  # -> 'el ol'

# negative jumps
s[::-1]  # -> 'dlrow olleh'

+ and *

:::python
[1, 2] + ['hello', 'world']  # -> [1, 2, 'hello', 'world']

'hello ' + 'world'  # -> 'hello world'

['a', 'b'] * 3  # -> ['a', 'b', 'a', 'b', 'a', 'b']

'hello ' * 3  # -> 'hello hello hello '

min / max

:::python
l = [2, 1, 3]

min(l)  # -> 1

max(l)  # -> 3