Simulate C macro in Python

Question

How can I automagically resolve format specifiers in Python? For example instead of:

MagicPrint(str.format('This is {}', my.name))

I want to write MagicPrint() function as follows:

MagicPrint('This is {my.name}')

Suggestions? Maybe I can use decorators for MagicPrint() function? Please note that my.name is not present in **locals() because MagicPrint() can be called from another module.

Its impossible! actually there are 2 way for putting variable within a string 1. is format and 2. using % notations.'This is %s'% my.name — Kasravnd
– Kasravnd, Commented Jun 21, 2015 at 16:21

kindall · Accepted Answer · 2015-06-21 16:27:10Z

0

class my: name = "Jerry"
"This is {my.name}".format(**locals())

answered Jun 21, 2015 at 16:27

kindall

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2 Comments

Alex Gill Over a year ago

That will only work when **locals() contains the my.name variable. I am looking for a method that receives my.name from another module.

kindall Over a year ago

You might want to put that in your question. You could also use vars(modulename) to get the variables from that module.

woot · Accepted Answer · 2015-06-21 17:02:24Z

0

that only work on **locals() contains . I am looking for a method that receives a.class_name from another module.

class a: class_name = "name_class"
"This is {a.class_name}".format(**locals())

edited Jun 21, 2015 at 17:02

woot

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answered Jun 21, 2015 at 16:42

Ca Pham Van

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Comments

Community · Accepted Answer · 2017-05-23 12:05:55Z

0

Used this solution to access caller's variables. Then I have automagical access to print the string.

def MagicPrint(s, *args, **kwargs):
    ''' In order for this to work we need the caller's module variables '''
    f = sys._getframe(1) 
    try:
        print (s.format(*args, **f.f_globals))
    except:
        print (s.format(*args, **f.f_locals))
    else:
        pass

edited May 23, 2017 at 12:05

CommunityBot

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answered Jun 21, 2015 at 18:05

Alex Gill

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