Python Quick Reference

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String variable

A string variable is created when the assigned value is between ' (quote) or " (double-quote) or by using the str() function.

Examples :

>>> A="String"

>>> print A

String

>>> A='String'

>>> print A

String

>>> A=str(56)

>>> print A+"Toto"

56Toto

Special characters as carriage return starts by a \ (backslash).

Examples :

>>> A="First line\nSecond line"

>>> print A

First line

Second line

>>> A="First line\\nSecond line"

>>> print A

First line\nSecond line

When a value contains special characters and they cannot be interpreted, it is better to use raw mode assignment. That is donne, by adding the letter r in lowercase before the value.

Examples :

>>> A=r"First line\nSecond line"

>>> print A

First line\nSecond line

>>> A=r"First line\\nSecond line"

>>> print A

First line\\nSecond line

List variable

A list is an array of elements indexed from zero. It can mix different types of element. Even, a list's element can be another list.

Examples :

>>> liste=[ "chaîne", 2.0,3 ]
>>> print liste
['cha\x8cne', 2.0, 3]
>>> print liste[0]
chaîne

>>> list=[1,2,3]
>>> list1=[list, 4, [ 5, 6] ]
>>> print list1
[[1, 2, 3], 4, [5, 6]]

Remark: This example was intentionally left in French to shows a string containing international characters.

Special variable

_ (Underscore)

This variable contains always the last value computed. It is really useful when the interpreter is used as calculator.
Remark: This special feature will be lost if this variable receives a value.

Examples :

Without _	With _
>>>5+10 15 >>>15/3 5	>>>5+10 15 >>>_/3 5

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