On 08/05/2013 10:19 PM, MRAB wrote:
On 06/08/2013 03:00, Devyn Collier Johnson wrote:
I am wanting to sort a plain text file alphanumerically by the lines. I
have tried this code, but I get an error. I assume this command does not
accept newline characters.
>>> file = open('/home/collier/pytest/sort.TXT', 'r').read()
That returns the file as a single string.
>>> print(file)
z
c
w
r
h
s
d
>>> file.sort() #The first blank line above is from the file. I do not
know where the second comes from.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'sort'
Strings don't have a sort method.
I had the parameters (key=str.casefold, reverse=True), but I took those
out to make sure the error was not with my parameters.
Specifically, I need something that will sort the lines. They may
contain one word or one sentence with punctuation. I need to reverse the
sorting ('z' before 'a'). The case does not matter ('a' = 'A').
I have also tried this without success:
>>> file.sort(key=str.casefold, reverse=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'sort'
Try this:
lines = open('/home/collier/pytest/sort.TXT', 'r').readlines()
lines.sort()
Actually, a more Pythonic way these days is to use the 'with' statement:
with open('/home/collier/pytest/sort.TXT') as file:
lines = file.readlines()
lines.sort()
Thanks! That works well. After I run your command, I run
print(''.join(lines))
to get the sorted output. Even the parameters work without issues.
lines.sort(reverse=True, key=str.casefold)
Mahalo,
DCJ
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