diff --git a/counter.py b/counter.py index 1e2fb56..09a4a59 100644 --- a/counter.py +++ b/counter.py @@ -2,34 +2,54 @@ from os.path import exists import sys -from pickle import dump, load +import pickle def update_counter(file_name, reset=False): - """ Updates a counter stored in the file 'file_name' - - A new counter will be created and initialized to 1 if none exists or if - the reset flag is True. - - If the counter already exists and reset is False, the counter's value will - be incremented. - - file_name: the file that stores the counter to be incremented. If the file - doesn't exist, a counter is created and initialized to 1. - reset: True if the counter in the file should be rest. - returns: the new counter value - - >>> update_counter('blah.txt',True) - 1 - >>> update_counter('blah.txt') - 2 - >>> update_counter('blah2.txt',True) - 1 - >>> update_counter('blah.txt') - 3 - >>> update_counter('blah2.txt') - 2 - """ - pass + """ Updates a counter stored in the file 'file_name' + + A new counter will be created and initialized to 1 if none exists or if + the reset flag is True. + + If the counter already exists and reset is False, the counter's value will + be incremented. + + file_name: the file that stores the counter to be incremented. If the file + doesn't exist, a counter is created and initialized to 1. + reset: True if the counter in the file should be rest. + returns: the new counter value + + >>> update_counter('blah.txt',True) + 1 + >>> update_counter('blah.txt') + 2 + >>> update_counter('blah2.txt',True) + 1 + >>> update_counter('blah.txt') + 3 + >>> update_counter('blah2.txt') + 2 + """ + if not exists(file_name) or reset: + #initialize to 1 + f = open(file_name, 'w') + d = pickle.dump(1, f) + f.close() + + #check that it worked + check = open(file_name, 'r') + initialized_value = pickle.load(check) + return initialized_value + else: + #open and find the value + f = open(file_name, 'r') + value = pickle.load(f) + 1 + f.close() + + #open and write a new value + f = open(file_name, 'w') + d = pickle.dump(value, f) + f.close() + return value if __name__ == '__main__': if len(sys.argv) < 2: