Make histogram in python with list

Question

I need some help making a histogram in python

Got some code like this:

import csv
import matplotlib.pyplot as plt

path = []

with open('paths_finished.tsv','r') as tsv:
    paths = [line.strip().split('\n') for line in tsv]
    newPath = paths[16:]
    counter = 0


for k in range(0,len(newPath)):
    path = newPath[counter][0].count(';')
    counter +=1

    print path

if i print path, i get a list with numbers like (9, 5, 1, 3, 12 , 7, 5, 9) and so on. Now i have to make a histogram of path. Any can help with that?

UPDATE:

My tsv file contains this:

['36dabfa133b20e3c', '1249525912', '112', '14th_century;China;Gunpowder;Fire', '2']
['20418ff4797f96be', '1229188046', '139', '14th_century;Time;Isaac_Newton;Light;Color;Rainbow', '1']
['08888b1b428dd90e', '1232241510', '74', '14th_century;Time;Light;Rainbow', '3']
['08888b1b428dd90e', '1232241601', '167', '14th_century;15th_century;Plato;Nature;Ultraviolet;Color;Rainbow', 'NULL']
['4cb0068c36658716', '1248654953', '253',  '14th_century;Time;Science;Nature;Weather;Sunlight;     <;Sun;Earth%27s_atmosphere;Ultraviolet;Color;Light;Rainbow', '3']
['1082b6b8501a04b1', '1248791776', '218', '14th_century;Christianity;Bible;God;Nature;Earth%27s_atmosphere;Ultraviolet;Optical_fiber;L    ight;Rainbow', '3']
['390ae528683f78ab', '1250727252', '66', '14th_century;Time;Astronomy;Light;Rainbow',   'NULL']
['0d57c8c57d75e2f5', '1283956474', '391',

My path prints this:

and alot more numbers.

We have only used the path you see on row[3] and counted how many path there are in each line and putted that into a list. — Pixel
– Pixel, Commented Apr 5, 2014 at 12:38

score 4 · Accepted Answer · 2014-04-05 13:42:03Z

4

Hopefully this is what your looking for?

path2 = list(set(path)) ## gets the unique values in the list

histo = []

for i in path2:
    histo.append(path.count(i)) ## add the number of occurances to the histo list

plt.bar(path2, histo)
plt.show()

Giving this as the output: enter image description here

To add axis names you can add this code:

plt.suptitle('Title', fontsize=14)
plt.xlabel('Number', fontsize=12)
plt.ylabel('Freq', fontsize=12)

EDIT Based on the uploaded tsv file:

import csv
import matplotlib.pyplot as plt

path = []

with open('paths_finished.tsv','r') as tsv:
    paths = [line.strip().split('\n') for line in tsv]
    newPath = paths[16:]
    counter = 0

items = []
for k in range(0,len(newPath)):
    path = newPath[counter][0].count(';')
    counter +=1
    items.append(path)
    print path

print items


path2 = list(set(items)) ## gets the unique values in the list

histo = []

for i in path2:
    histo.append(items.count(i)) ## add the number of occurances to the histo list

plt.bar(path2, histo)
plt.suptitle('Title', fontsize=14)
plt.xlabel('Number', fontsize=12)
plt.ylabel('Freq', fontsize=12)
plt.show()

Giving the output: enter image description here

edited Apr 5, 2014 at 13:42

answered Apr 5, 2014 at 12:49

user3494103

Sign up to request clarification or add additional context in comments.

15 Comments

user3494103 Over a year ago

No add it after the print path code you have. I'm not sure if this is what you want though? Are you wanting to plot the frequency of the numbers in path? or plot the numbers in path against the first column of the tsv file?

Pixel Over a year ago

just want to plot the frequency of the numbers in path with a histogram.

user3494103 Over a year ago

What line is it coming from?

Pixel Over a year ago

from this one: path2 = list(set(path)) ## gets the unique values in the list

user3494103 Over a year ago

What does your 'print path' output?

|

Collectives™ on Stack Overflow

Make histogram in python with list

1 Answer 1

15 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

15 Comments

Your Answer

Sign up or log in

Post as a guest

Related