python - Writing a different statement for an error -


i have written program on files i/o in python, contains part file opened i.e 

.... f = open("<filename.txt", "r") alltext = f.readlines() ....

in case file not found, want write print statement saying, "sorry, file not found." tried using error handling (for & except), did not work because of nested code after above. appreciated.

thanks

use os.path.isfile:

https://docs.python.org/2/library/os.path.html#os.path.isfile

also, if need read text, want do:

if os.path.isfile(f):     open("filename.txt") f         alltext = f.read() else:     # print statement goes here

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