Python values and strings

Python data type

Numerical

String

List

Meta-group

Dictionary

1.1 Types of numeric values

Plastic

Long integer type

Floating point number

Plural class

String type, there are 3 ways to define:

There is no difference between single and double quotes in Python, where single quotes are fully referenced in the shell, and double quotes represent partial references.

str = ' This is a string '

str = "This is a string"

str = "This is a string"

A = "Hello\nworld"

Sanchong quotes can either represent comments or define strings.

Strings belong to " sequences"and can be indexed and sliced operations.

A = ' ABCDE '

A[-1] indicates the last character

A[0]+A[1] value is AB

A[0:2] means taking from the first start, taking to the 2nd one.

Usually 0 is omitted, the expression is taken from the first start

The second ellipsis indicates the string to be taken to the last one.

A[-1:]

Step A[::1]

To take from the back:

A[-4:-2] can be taken to BC

Abcd

[ -4,-2]

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Python values and strings