How to read a csv file in Python?

Question

I need to read a csv file (named CityPop.csv ) and this is the code I have:

import csv

with open ('CityPop.csv', 'r') as f:
    read_data = f.read()
    for line in f:
        record=line.strip().split(",")
print read_data

f.close()

But when I try to run it, nothing is output.

I am not sure how to continue; this only leads into more advanced tasks I need to complete, which is difficult if I can't even figure this out.

Answer 1

Try this code

import csv

    with open ('CityPop.csv', 'r') as f:
        reader = csv.reader(f, delimiter=",")
        #read_data = f.read()
        for line in reader:
            print(line)
            #record=line.strip().split(",")
    #print (read_data)

    f.close()

EDIT As Ralf said " f.close() is not necessary when using a with block"

Answer 2

An easier way of reading csv files using pandas library -

import pandas

df = pandas.read_csv('CityPop.csv')

print(df)

or you can try modifying your code as below -

import csv

with open ('CityPop.csv', 'r') as f:

  read_data = csv.reader(f,delimiter=',')

  for row in read_data:

            print(row)

Answer 3

You have imported the csv module but never used it. So try read_data = csv.reader(f) .

Answer 4

I suggest you follow the example from the docs of the python csv module :

import csv
with open('CityPop.csv') as f:
    csv_reader = csv.reader(f, delimiter=', ')
    for row in csv_reader:
        print ', '.join(row)

---

Analizing your code, there are a few issues:

1. you don't need to call f.close() if you use a with statement, the file will be closed automatically when exiting the with block
2. your print statement should go inside the with block, as the variable read_data is defined inside it
3. you would need to iterate read_data ( for line in read_data: ), because you already used f.read() so that iterating over f will no yield anything
4. you are overwriting record each time, so I don't know why you want to it that way

Answer 5

import csv

with open('CityPro.cvs') as f:
    r = csv.reader(f, delimiter=',')
    for line in r:
            print(line)
    f.close()