CODEWITHSUNDEEP
pythonpython-2.7
Wachira
Wachira

Reputation: 31

Error: can only concatenate list (not "int") to list

I am getting this error when I try to populate users First_Name in a csv file. Can someone show me what I am doing wrong

 import csv

# Define users 
valid_input = False
while not valid_input:
    users =raw_input('Number of users: ')
    try:
        users = range(0,int(users))
        valid_input = True
    except:
        print "Invalid input"
        pass

First_Name = ["Test"+str(user) for user in  range (1, users+1)]
Last_Name = ["User%s" %user for user in users]
Email_Addresses = []
for user in users:
    email= raw_input("Email domain for user %d: " %user)
    Email_Addresses.append(Last_Name[user] + email)
Password = ["Password1" for user in users]
Group =["Test" for user in users]
Admin = ["Yes" for user in users]
# open a file for writing.
# open a file for writing.
with open('users.csv', 'wb') as csv_out:
    writer = csv.writer(csv_out)
    writer.writerows(zip(Email_Addresses, Password, First_Name, Last_Name, Group, Admin))

This is the Traceback I am getting Traceback (most recent call last): First_Name = ["Test"+str(user) for user in range (1, users+1)] TypeError: can only concatenate list (not "int") to list

Upvotes: 2

Views: 18460

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1121784

users is a list:

users = range(0,int(users))

but you then try to create a new range from that list:

First_Name = ["Test"+str(user) for user in  range (1, users+1)]

where users + 1 is an attempt to add 1 to a list.

Don't do that. Just loop over your existing range:

First_Name = ["Test"+str(user + 1) for user in users]

Upvotes: 4

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