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02 - NAMING OF VARIABLE
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02 - NAMING OF VARIABLE
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Comming to naming of a variable there are certain rules to name a varibel , let's see what are they
1.we cannot use key words as a varibale name
So, what is a key word : a key word is nothing but a word which has specific definition for it or which are predefined by the interpretter
some of the key words are followed:
if, else, elif, sum, list, tuple, int, float , bool, class, def, break ,continue, pass , try, except ,etc....
2.we can use alphabets to name our variable
we have from a-z and A-Z
3. we can have numbers in our name of the variable
we can use numbers from 0 - 9
NOTE : we cannot use numbers in the beginning of a variable like (0num, 234adre, 007number) these are not valide variables
4.we can use (_) underscore in our name of the varibale
NOTE: we can use _ in the stariting of a variabel in middle of a variable and at the ending of a variable
so any variable name satifies all the 4 conditions are valide variable
examples:
VALIDE:
1.num
2.num_2
3.num3
4._num
5.n_u_m
6.Num4
INVALIDE:
1.0num - number at the beginning of the name
2.sum - cannot use keywords in name
3.-num - special character (-) is not allowed
4.$dun - sepcial character ($) is not allowed
5.class - keywords are not allowed
NOTE : Num and num are treated diffetent because python is a case sensitive lang, which means N and n are treated differently