Rename footage '.dpx' files from c500 footage if cables are switched leaving the camera.

rename.py

'''
This is a script to fix c500 footage that got mixed up.

If the SDI cables are switched leaving the camera entering the recorder
then file names will be incorrect. Files that should be numbed even are odd,
and files that are odd should be even. 

Luckily those files are also separated into two different folders.

**Run this script in each folder separately before merging the footage **
**If you merge the footage and then run this script, you will overwrite**
**half of your files, only the even frames will be stored and renamed  **

to run:
1) move rename.py to the folder of footage
2) navigate to your footage in the terminal
3) once in your folder, type 'ls' to confirm 'rename.py' is in the directory
4) if its there type 'python rename.py', the filenames in your folder should change almost instantly

Odd becomes even:
DAOL----035_0000001.dpx -> DAOL----035_0000000.dpx

Even becomes odd:
DAOL----035_0000000.dpx -> DAOL----035_0000001.dpx

'''

from os import rename, listdir

starttemplate = 'DAOL----035_' #change this variable to whatever your naming convention is
endtemplate = '.dpx' #should be the file extension, change if different     

files = listdir('.') #takes the contents of your current directory and puts it in a variable
print files #Just to provide visual feedback that its working. 

def renameclause(source_file):
    source = source_file
    digits = source[12:-4]
    if int(digits)%2==0: #checks if even
        newdigits = str(int(digits)+1) #creates a string of the digits + 1
        while len(newdigits) != 7: #makes sure the files have 7 digits after the number, adjust for naming conventions if needed
            newdigits = '0' + newdigits 
        newfilename = starttemplate + newdigits + endtemplate #creates the new name
        rename(source_file, newfilename) #renames file

    elif int(digits)%2!=0: #checks if odd
        newdigits = str(int(digits)-1) #creates a string of the digits -1
        while len(newdigits) != 7: #makes sure the files have 7 digits after the number, adjust for naming conventions if needed
            newdigits = '0' + newdigits
        newfilename = starttemplate + newdigits + endtemplate #creates the new name
        rename(source_file, newfilename) #renames file

for i in files: #loops through files
    if '.dpx' not in i: #checks to see if file is needed, change if naming convention dictates, 
        print 'nevermind' #nevermind
    else:
        renameclause(i)  #performs rename