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File handling - reading filenames

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File handling - reading filenames

 
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  #1
Oct 24th, 2009
My file directory is full of filenames with "male" and "female" being part of them. I want to loop through the directory and distinguish between the two.

Python Syntax (Toggle Plain Text) 
  1.  
  2. import os
  3.  
  4. maleDataSets = 0
  5. femaleDataSets = 0
  6. females = []
  7. males = []
  8.  
  9. filePath = "Dataset/parameter feature vectors"
  10. for file in os.listdir(filePath):
  11.     femaleDataSets = file.find("female")
  12.     if femaleDataSets == -1:
  13.         females.append(femaleDataSets)
  14.         print file
  15.     else:
  16.         males.append(...)

I'd like to be able to say... if femaleDataSets are found, print their filenames - just to show that I am reading the correct files. Not sure if I am searching correctly. Any help would be greatly appreciated!
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  #2
Oct 24th, 2009
Try this ...
python Syntax (Toggle Plain Text) 
  1. import os
  2.  
  3. maleDataSets = 0
  4. femaleDataSets = 0
  5. females = []
  6. males = []
  7.  
  8. filePath = "Dataset/parameter feature vectors"
  9. for fname in os.listdir(filePath):
  10.     data_str = open(fname).read()
  11.     # returns index of first "female" find
  12.     # returns -1 if not found 
  13.     index = data_str.find("female")
  14.     if index != -1:
  15.         females.append(index)
  16.         print fname
  17.     else:
  18.         males.append(...)
May 'the Google' be with you!
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  #3
Oct 24th, 2009
Thanks for your reply. The first file in my directory isn't female, I don't think that has anything to do with this... but I am getting this error:

data_str = open(fname).read()
IOError: [Errno 2] No such file or directory: 'Bmale_22.b_app'


Python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     data_str = open(fname).read()
  4.     index = data_str.find("female")
  5.     if index != -1:
  6.         females.append(index)
  7.         print fname
  8.     else:
  9.         # append the ones that aren't female to a males
Last edited by bol0gna; Oct 24th, 2009 at 3:12 pm.
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  #4
Oct 24th, 2009
Always use absolute path+file names.
Python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     complete_name = os.path.join(filePath, fname)
  4.     data_str = open(complete_name).read()
  5.     index = data_str.find("female")
  6.     if index != -1:
  7.         females.append(index)
  8.         print fname
  9.     else:
  10.         print "append the ones that aren't female to a males"
Linux counter #99383
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  #5
Oct 24th, 2009
Not quite sure why this is happening... the only output I get here is "male" looped over many times...could it be the way we are searching?

Python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     complete_name = os.path.join(filePath, fname)
  4.     data_string = open(complete_name).read()
  5.     index = data_string.find("female")
  6.     if index != -1:
  7.         females.append(index)
  8.         print fname
  9.     else:
  10.         print "male"

example of a few filenames:
BMale_22.b_app
EMBfemale20-2neutral.b_app
EMIfemale26neutral.b_app
EMImale23-2neutral.b_app

Would a regular expression be better?
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  #6
Oct 24th, 2009
Thank you for the help everyone! These solutions all work for me, I was indenting incorrectly. Apologies!
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  #7
Oct 25th, 2009
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Originally Posted by woooee View Post
Always use absolute path+file names.
Python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     complete_name = os.path.join(filePath, fname)
  4.     data_str = open(complete_name).read()
  5.     index = data_str.find("female")
  6.     if index != -1:
  7.         females.append(index)
  8.         print fname
  9.     else:
  10.         print "append the ones that aren't female to a males"
I don't think this is doing what bol0gna wants actually. In the original post bol0gna wants to sort on the filenames, while your code is actually searching the content of each file. Here's a version that works on the filename:
python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     if fname.count('female'):
  4.         females.append(fname)
  5.     elif fname.count('male'):
  6.         males.append(fname)
Last edited by The_Kernel; Oct 25th, 2009 at 4:02 am.
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  #8
Oct 25th, 2009
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Originally Posted by The_Kernel View Post
I don't think this is doing what bol0gna wants actually. In the original post bol0gna wants to sort on the filenames, while your code is actually searching the content of each file. Here's a version that works on the filename:
python Syntax (Toggle Plain Text) 
  1. filePath = "Dataset/parameter feature vectors"
  2. for fname in os.listdir(filePath):
  3.     if fname.count('female'):
  4.         females.append(fname)
  5.     elif fname.count('male'):
  6.         males.append(fname)
Looking at all the clues sprinkled in, you are so right. He only wants to look at filenames, so kudos to you.
May 'the Google' be with you!
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