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>>> f = open('/tmp/version.txt', 'r')
>>> f
<open file '/tmp/version.txt', mode 'r' at 0xb788e2e0>
>>> f.readlines()
['2.3.4\n']
>>> f.readlines()
[]
>>>
I've tried this in Python's interpreter. Why does this happen?
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The readlines() method returns a list containing each line in the file as a list item.
The readlines method returns the contents of the entire file as a list of strings, where each item in the list represents one line of the file. It is also possible to read the entire file into a single string with read .
readlines doesn't return strings. It returns a list of some number of strings.
You need to seek to the beginning of the file. Use f.seek(0) to return to the begining:
>>> f = open('/tmp/version.txt', 'r')
>>> f
<open file '/tmp/version.txt', mode 'r' at 0xb788e2e0>
>>> f.readlines()
['2.3.4\n']
>>> f.seek(0)
>>> f.readlines()
['2.3.4\n']
>>>
Python keeps track of where you are in the file. When you're at the end, it doesn't automatically roll back over. Try f.seek(0).
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