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python- import numbers from file to do calcs

 

python- import numbers from file to do calcs
crocadilekyle

1 Oct, 2009 - 07:58 PM
Post #1

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Joined: 2 Aug, 2009
Posts: 29
So i am trying to write some code (in Python) that will import some numbers from a file. I was thinking maybe to import them into a list so that way I can do calculations with them using a for loop or something...

Here is the code that writes numbers to a file.

CODE


import math

myfile = open('myfile.py', 'w')

L1 = [1,2,3,4,5]
for i in L1:
      a = math.pi*(i**2)
      myfile.write( repr(a))
      myfile.write("\n")
        
myfile.close()



and here is the code that imports the numbers from a file and I would like them to import into a list. unless someone has a better idea....

CODE

myfile = open('myfile.py', 'r');
i=0

while i < 5:
    print myfile.readline()
    i = i+1
    



Any help is appreciated.

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Nallo

RE: Python- Import Numbers From File To Do Calcs

3 Oct, 2009 - 04:30 AM
Post #2

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Joined: 19 Jul, 2009
Posts: 24



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My Contributions
Take a look at the list methods in the Pythondocumentation. In your case you need list.append().
li.append(new_element) appends new_element to an existing list li.

CODE
li = []
for i in range(5):
    line = myfile.readline()

    line = line.rstrip() #remove the trailing whitespace, especially the newline character
    number = float(line) #convert the string back to a number

    li.append(number)
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