add string to the end of a letter python

Question

How can I do the following in python;

for i in range(4):
  s_i = 3

so I get

s_0 = 3
s_1 = 3
s_2 = 3
s_3 = 3

Answer 1

Keep data out of your variable names. If you want numbered variables, you really need a list:

s = [3] * 4

Then you can access elements with indexing notation:

s[2] = 5

instead of trying to build variable names dynamically.

If you want more general dynamically-named variables, like variables whose names come from user input, you really need a dict:

parents = {}
for i in xrange(5):
    child = raw_input('Enter child name:')
    parent = raw_input('Enter parent name:')
    parents[child] = parent

Answer 2

I didn't get your question exactly. But I have tried this:

for i in range(4):
    exec('s_'+str(i) + '=i')

Out Put :
    s_0 = 0
    s_1 = 1
    s_2 = 2
    s_3 = 3

on the fly we are creating 4 variables and assigning values to it.

Answer 3

While the following works, it seems like a very, very bad idea:

>>> for j in range(4):
...     globals()['s_{}'.format(j)] = 3
...
>>> s_0
3
>>> s_1
3
>>> s_2
3
>>> s_3
3

EDIT Replaced locals() with globals() . According to the docs for locals() :

The contents of this dictionary should not be modified; changes may not affect the values of local and free variables used by the interpreter.