Python Pocket Reference, 3rd Edition

Specific Built-in Types

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Slicing: S[i:j:k]

• If present, the third item k is a stride: added to the offset

of each item extracted.

•

S[::2] is every other item in sequence S.

•

S[::-1] is sequence S reversed.

•

S[4:1:-1] fetches from offsets 4 up to, but not including,

1, reversed.

Other

• Concatenation, repetition, and slicing return new objects

(not always for tuples).

Specific Built-in Types

This section covers numbers, strings, lists, dictionaries,

tuples, files, and other built-in types. Compound datatypes

(e.g., lists, dictionaries, and tuples) can nest inside each other

arbitrarily, and as deeply as required.

Numbers

This section covers basic number types (integers, floating-

point), as well as more advanced types (complex, unlimited-

precision long integers). Numbers are always immutable

(unchangeable).

Literals

Numbers are written in a variety of numeric constant forms.

1234, -24, 0

Normal integers (C longs, at least 32 bits)

99999999L, 42l

Long integers (unlimited size)

1.23, 3.14e-10, 4E210, 4.0e+210, 1., .1

Floating-point (C doubles)