Calculate String - Dev Shed

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March 30th, 2004, 10:22 PM

jimo9

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Calculate String

Help, I have a string that contains a mathematical expression(very simple can only contain +,-,*,and\) How do I get python to evaluate that string? Thanks, btw I need to ensure that the divison is integer division. Thanks!
example
str="3+5*2\1"

Last edited by jimo9 : March 30th, 2004 at 10:30 PM.

March 31st, 2004, 12:56 AM

Grim Archon

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The eval() function is what you want:

Code:

>>> eval("1+1/2")
1
>>> eval("1+1/2.0")
1.5
>>> eval("1+1//2")
1
>>> eval("1+1//2.0")
1.0
>>> string = "1+1/2.0".replace('/','//')
>>> string
'1+1//2.0'

Grim

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