How to delete a line from a file using python -

i using following code find lines contains ':' special character. later trying remove lines file -

myfile = open('mypost.txt', 'rb')     mytext = myfile.readlines()     line in mytext:              line.find(":") == "-1"          if line.find(":"): 

is there function in python returns line character found (find() returns either -1 or location of searched character in line) or if use find() how delete lines value of find() -1?

using fileinput

optional in-place filtering: if keyword argument inplace=1 passed fileinput.input() or fileinput constructor, file moved backup file , standard output directed input file (if file of same name backup file exists, replaced silently). makes possible write filter rewrites input file in place.

mypost.txt

abc de:f ghi 

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import fileinput line in fileinput.input('mypost.txt', inplace=true):      if ':' in line:         continue # skip     print line.rstrip('\n') # stdout redirected file 

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mypost.txt

abc ghi 

the thing solution doesn't use .readlines() loads whole file memory, instead writes temporary file renamed original.