How to calculate a file of equations in python

[John]

Hi,
I have a text file which contains math expression, like this
134
+234
+234

(i.e. an operation (e.g. '+) and then a number and then a new line).

Can you please tell me what is the easiest way to calculate that file?
for example the above example should be = 134 + 234 + 234 = 602.

Thank you.

 

[Michael Bentley]

Hi,
I have a text file which contains math expression, like this
134
+234
+234

(i.e. an operation (e.g. '+) and then a number and then a new line).

Can you please tell me what is the easiest way to calculate that file?
for example the above example should be = 134 + 234 + 234 = 602.

Easiest?

eval(' '.join(open(fileName).readlines()).replace('\n',''))

 

[Michele Simionato]

Easiest?

eval(' '.join(open(fileName).readlines()).replace('\n',''))

Or use one of the many safe_eval recipes out there, for instance

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/364469


Michele Simionato

 

[Paul Rubin]

I have a text file which contains math expression, like this
134
+234
+234

Erm, is this a homework assignment? Basicaly you need to identify all
the separate operands and operators and decide what to do with them.
I'm guessing you don't have to worry about operator precedence, for
example the rule that 2+3*5 is treated as 2+(3*5) because * has
precedence over +. Anyway the idea is keep a running total and
read through the input lines updating the total for each line.

 

[Boris Borcic]

r=''
for line in file : r = str(eval(r+line))