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Basic Operations on variables Assign several variables in the same timeSeveral
variables separated by = (equal) can be assign in the same time. The
value must be put after the last equal. That reduces the number of lines and create more
readable code. The way to use variable
does not change whatever the assignment's type.
Examples : Multiple assignment  Simple assignment  >>>A=B=C=0 >>>A+=1 >>>B+=2 >>>C+=3 >>>print A,"\n", B, "\n", C 1 2 3  >>>A=0 >>>B=0 >>>C=0 >>>A+=1 >>>B+=2 >>>C+=3 >>>print A,"\n", B, "\n", C 1 2 3  The
multiple assignments can be used on list variables too. However, all
list variables initialized with the several assignments method will not
act in the same way than each one initializes separately. In
reality, creates several list variables at once will create one
list called by different name.
Examples : Multiple assignment  Simple assignment  >>>A=B=C=[ "1", 2, 3] >>>A+=["4", 5, 6] >>>B+=["7", 8, 9] >>>C+=["10", 11, 12] >>>print A,"\n", B, "\n", C ['1', 2, 3, '4', 5, 6, '7', 8, 9, '10', 11, 12] ['1', 2, 3, '4', 5, 6, '7', 8, 9, '10', 11, 12] ['1', 2, 3, '4', 5, 6, '7', 8, 9, '10', 11, 12]  >>>A=[ "1", 2, 3] >>>B=[ "1", 2, 3] >>>C=[ "1", 2, 3] >>>A+=["4", 5, 6] >>>B+=["7", 8, 9] >>>C+=["10", 11, 12] >>>print A,"\n", B, "\n", C ['1', 2, 3, '4', 5, 6] ['1', 2, 3, '7', 8, 9] ['1', 2, 3, '10', 11, 12]  Empty list creationA empty list variable can be create by assign to it a empty value or with the range() function.
Examples :
Assign an empty value  Use the range() function  >>> list=[]
>>> print list[]
 >>> list=range(1,0)
>>> print list[] 

