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Full Discussion: Python Count Number Of Occurence
Top Forums Programming Python Count Number Of Occurence Post 302950280 by infinitydon on Thursday 23rd of July 2015 06:52:22 AM
Old 07-23-2015
Python Count Number Of Occurence
Hello,

I have a programming assignment to count number of occurrences of hours in particular file. Below is the code:

Code:
fname = raw_input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
largest = None
fh = open(fname)

counts = dict()

test = list()
for line in fh:
    line = line.rstrip()
    if not line.startswith('From'): continue
    if line.startswith('From:'): continue
    words = line.split()
    h = words[5]
    h = h.split(':')
    test.append(h[0])    
    for w in tes:
     counts[w] = counts.get(w, 0 ) + 1
print test
print counts

Output of "print test" which I believe is ok:

Code:
['09', '18', '16', '15', '15', '14', '11', '11', '11', '11', '11', '11', '10', '10', '10', '09', '07', '06', '04', '04', '04', '19', '17', '17', '16', '16', '16']

Output of "print counts":

Code:
{'11': 111, '10': 42, '15': 47, '14': 22, '04': 24, '16': 31, '19': 6, '18': 26, '09': 39, '17': 9, '06': 10, '07': 11}

I don't know why "print counts" is giving a large number of counts?

---------- Post updated at 11:52 AM ---------- Previous update was at 09:53 AM ----------

I figured out the issue!

It was the nested FOR loop:

for w in tes: counts[w] = counts.get(w, 0 ) + 1
I have written the code again:

Code:
fname = raw_input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
largest = None
fh = open(fname)

counts = dict()

test = list()
lst = list()
for line in fh:
    line = line.rstrip()
    if not line.startswith('From'): continue
    if line.startswith('From:'): continue
    words = line.split()
    h = words[5]
    h = h.split(':')
    test.append(h[0])
for w in test:
 counts[w] = counts.get(w, 0 ) + 1
print test
print counts

Thanks!
 

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LEARN ABOUT DEBIAN

wc

WC(1)								   User Commands							     WC(1)

NAME

       wc - print newline, word, and byte counts for each file

SYNOPSIS

       wc [OPTION]... [FILE]...
       wc [OPTION]... --files0-from=F

DESCRIPTION

       Print  newline, word, and byte counts for each FILE, and a total line if more than one FILE is specified.  With no FILE, or when FILE is -,
       read standard input.  A word is a non-zero-length sequence of characters delimited by white space.  The options below may be used to select
       which counts are printed, always in the following order: newline, word, character, byte, maximum line length.

       -c, --bytes
	      print the byte counts

       -m, --chars
	      print the character counts

       -l, --lines
	      print the newline counts

       --files0-from=F
	      read input from the files specified by NUL-terminated names in file F; If F is - then read names from standard input

       -L, --max-line-length
	      print the length of the longest line

       -w, --words
	      print the word counts

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Paul Rubin and David MacKenzie.

REPORTING BUGS

       Report wc bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report wc translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for wc is maintained as a Texinfo manual.  If the info and wc programs are properly installed at your site, the com-
       mand

	      info coreutils 'wc invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							     WC(1)
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