As Les said use this with care as it can be dangerous. But Python
recognizes we are all adults so ...
Here is a solution using the built in function execfile. First you need a
file containing the definitions you want to add in. Here is your sample
with the second item corrected (lambda was spelled wrong and daddy was
undefined):
# file of identifiers to load:
foo="bar"
dad=lambda daddy:"Happy fathers day "+str(daddy)
myFavoriteNumber=2
# end file
Here is a sample module using execfile to load the identifiers:
# modTest.py load run time identifiers
print 'locals before loading identifier file:'
print locals()
# load the identifier file
execfile('modTest.txt', globals(), locals())
print 'locals after loading identifier file:'
print locals()
# test identifiers:
print 'foo:', foo
print 'dad("daddy")', dad("daddy")
print 'myFavoriteNumber', myFavoriteNumber
# end modTest code
And the result of running the sample:
locals before loading identifier file:
{'__builtins__': <module '__builtin__' (built-in)>, '__name__': '__main__',
'__file__': 'D:\\Users\\Work\\Documents\\Demonstrations\\modTest.py',
'__doc__': None, '__package__': None}
locals after loading identifier file:
{'dad': <function <lambda> at 0x0225F970>, 'myFavoriteNumber': 2,
'__builtins__': <module '__builtin__' (built-in)>, '__file__':
'D:\\Users\\Work\\Documents\\Demonstrations\\modTest.py', '__package__':
None, '__name__': '__main__', 'foo': 'bar', '__doc__': None}
foo: bar
dad("daddy") Happy fathers day daddy
myFavoriteNumber 2
This should do what you want. But be careful.
Richard
-----Original Message-----
From: derek riemer
Sent: Saturday, June 20, 2015 7:18 PM
To: pythonvis@xxxxxxxxxxxxx
Subject: [pythonvis] question about converting strings to variables?
Hi,
In python (or any language) is is possible to convert a string to a
variable? For example, if I have something like a file with
foo="bar"
dad=lammbda daddy:"Happy fathers day "+str(daddy)
myFavoriteNumber=2
Could I read these in from a file and get in the computers memory the
variable dad = a function, foo="bar" and so on?
This would be pretty helpful, in being able to actually write compilers,
or simple scripting languages.
How is this type of thing achieved?
Thanks,
Derek
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