[Tutor] Writing processed text to another file(beginner)

[Mayo Adams]

Code to build a list z to contain all the first words in each line of a
text file:

z=[]

f=open('C:/atextfile.txt')

for aLine in f:

str=aLine

a=str.split()

z.append(a)


I would like to work further with the list z once the file has been
stripped, and the list is complete but am so clueless about Python and its
curlybracelessness that I don't know when the for loop terminates.
Obviously I don't want to write to the file after every line is read.
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