Say I have a thousand variables. v1,v2,v3,...,v1000, but they are just variables not in a list.
Is there any way I can loop them.
I know in c I can use Marcos.
But how can I do it in python? Any hints will be helpful.
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An example of the data and the expected output would be nice.user– user2015-02-05 23:37:17 +00:00Commented Feb 5, 2015 at 23:37
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2thousands of variables??? wouldn't it be easier to use arrays? i mean arrays were made to solve this problem..bakriawad– bakriawad2015-02-05 23:37:39 +00:00Commented Feb 5, 2015 at 23:37
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You could, but there is no way it would be better than using a list.khelwood– khelwood2015-02-05 23:38:39 +00:00Commented Feb 5, 2015 at 23:38
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@bakriawad The problem is they are not in arrays or in files. They are just variables in another source code.AlexWei– AlexWei2015-02-05 23:39:17 +00:00Commented Feb 5, 2015 at 23:39
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@AlexWei that was helpful, should include in question along with what the variables are or what they look like.. i don't know python but i am thinking you are looking for a way the compiler would look for all the variables there and gets them into a list then execute a loop. try looking for a method that returns all the variables in a code.bakriawad– bakriawad2015-02-05 23:42:56 +00:00Commented Feb 5, 2015 at 23:42
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2 Answers
Alternative way is to use vars(). for example:
v1='dd';
v2=32;
v4=12;
import re
re_p = re.compile('^v\d+')
var_list = vars().copy()
for a_var in (v for v in var_list if re_p.match(v)):
print(a_var, var_list[a_var])
Prints:
v1 dd
v4 12
v2 32
Comments
v1 = 'foo'
v2 = 'bar'
v3 = '42'
for i in range(1,4):
print vars()['v' + str(i)]
1 Comment
AlexWei
@taesu Thanks for your answer. I have checked your code have answered my question. Since Marcin give the link of the vars and more formal than your answer. I will accept his as the answer and upvote your answer. Hope you don't mind. Thanks your answer again. It helps.