计算列表列表中的项目

Question

I can't figure out how to count within a list of lists that was imported from a txt file. It is just a list of job details (about 100 jobs).

Each list format looks like this:

['Business Analyst', 'Hotwire.com', 'San Francisco CA', 'NA', 'Full Time', 'Bachelors', '3', 'Business Analysis', 'Business Intelligence', 'IT development', 'UML', 'BPMN', 'Applied Analytics', 'Statistics', 'Communication Skills', 'Sales Experience', 'Organized', 'Detail-Oriented']

I want to make a new list of a specific detail to count and graph eventually.

For example, I want to create a list of cities (index[2]).

data = []
with open('Travel Industry Jobs.txt') as f:
    for line in f:
        data.append(line.strip().split(','))

f.close()

for i in data:
    count = 0
    city = data[i].count("San Francisco CA")
    count += city

Answer 1

You can pull out a column easily with list comprehensions

cities = [row[2] for row in data]

You could also use other tools such as collections.Counter with a generator that emits all of the cities. Here each city gets its own key in a dictionary. Any minor spelling deviations get different entries, so beware

citycount = collections.Counter(row[2] for row in data)

Answer 2

a = [[1,2,3],[2,3,4]]
for t in a:
  print len(t)