[SOLVED] Python TypeError: unhashable type: 'list'

MrLinuxDonnelly · 02-20-2017, 07:59 AM

Ok so quick overview

i have a python script which basically counts the amount of times a line occurs and produces a output with the string and occurrences

this is the working code

echo -e "username is richard\nusername is bob\nusername is phil" | awk '{print $3}' | ./lineCount1.py
1 bob
1 phil
1 richard

Code:

#!/usr/bin/python
import sys 
names = {} 
for name in sys.stdin.readlines(): 
        name = name.strip() 
        if name in names:
                names[name] += 1
        else:
                names[name] = 1
for name, count in names.iteritems(): 
        sys.stdout.write("%d\t%s\n" % (count, name))

Now i wanted to remove having to format (use awk) before entering the data into the script so i used the .split functionality which seems to break it

echo -e "username is richard\nusername is bob\nusername is phil" | ./lineCount2.py
Traceback (most recent call last):
File "./lineCount2.py", line 8, in <module>
if name in names:
TypeError: unhashable type: 'list'

Code:

#!/usr/bin/python

import sys
names = {}
for line in sys.stdin.readlines():
        word = line.split()
        name = [line[2]]
        if name in names:
                names[name] += 1
        else:
                names[name] = 1
for name, count in names.iteritems():
        sys.stdout.write("%d\t%s\n" % (count, name))

Ive read up on this a bit and can see its something to do with it needing to be tuples ? Had a play around but cant seem to get it to work. Any help would be appreciated.

pan64 · 02-20-2017, 08:14 AM

just read carefully these two lines:

Code:

        word = line.split()
        name = [line[2]]

MrLinuxDonnelly · 02-20-2017, 09:08 AM

Quote:

Originally Posted by pan64

just read carefully these two lines:

Code:

        word = line.split()
        name = [line[2]]

Ahhh yes ive changed as per below however same error

Code:

#!/usr/bin/python

import sys
names = {}
for line in sys.stdin.readlines():
        word = line.split(' ')
        name = [word[2]]
        if name in names:
                names[name] += 1
        else:
                names[name] = 1
for name, count in names.iteritems():
        sys.stdout.write("%d\t%s\n" % (count, name))

Code:

echo -e "username is richard\nusername is bob\nusername is phil"  | ./lineCount2.py 
Traceback (most recent call last):
  File "./lineCount2.py", line 8, in <module>
    if name in names:
TypeError: unhashable type: 'list'

pan64 · 02-20-2017, 09:14 AM

why name = [word[2]]
probably: name = word[2] ??

MrLinuxDonnelly · 02-20-2017, 09:16 AM

Quote:

Originally Posted by pan64

why name = [word[2]]
probably: name = word[2] ??

ahhh yes why did i put that in a "[]" would have cause the output to be in a bracket also.

Thanks for pointing out my madness much appreciated

pan64 · 02-20-2017, 09:23 AM

glad to help you.
If you want to say thanks just click on yes.
This is not madness, this is called practising.