CODEWITHSUNDEEP
pythoncgi
john john
john john

Reputation: 127

TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

Test.py code which takes the values from HTML and printing to file gets an traceback error Why the error of file descriptor is comming. I am an newbie.

#!/usr/bin/python
import cgi

def get_data():
    '''
    This function writes the HTML data into the file 

    '''

    print "Content- type : text/html\n"

    form = cgi.FieldStorage()

    f = open("abc.txt","w")

    f.write(form.getvalue('firstname'))
    f.write(form.getvalue('lastname'))
    f.write(form.getvalue('age'))
    f.write(form.getvalue('gender'))
    f.close() 

    #print "Hello ", Fname, Lname, Age, Gender

get_data()

Tracebacjk Error:

Traceback (most recent call last):
 File "test.py", line 33, in <module>
get_data()
File "test.py", line 25, in get_data
f.write(form.getvalue('firstname') + '\n')
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

My HTML source file

 <html>
<head>
<title>INFORMATION</title>
</head>
<body>
 <form action = "/cgi-bin/test.py" method = "post">
    FirstName:
    <input type = "text" name = "firstname" /><br>
    LastName:
    <input type = "text" name = "lastname" /><br>
    Age:
    <input type = "text" name = "age" /><br>
    Gender:
    <input type="radio" name="gender" value="male" /> Male
    <input type="radio" name="gender" value="female" /> Female

    <input type = "submit" name = "submit "value = "SUBMIT">
    <input type = "reset" name = "reset" value = "RESET">
    </form>
 </body>

Added html file.PLease check

Upvotes: 1

Views: 6004

Answers (1)

falsetru
falsetru

Reputation: 369294

The code opens the file with write mode (w).

You cannot iterate the file opened with write mode.

If you want write the passed POST data to file, just write. (without for loop). Append newline (\n) if you want the values are line separated.

f = open("abc.txt","w")
f.write(form.getvalue('firstname', '?') + '\n')
f.write(form.getvalue('lastname', '?') + '\n')
f.write(form.getvalue('age', '?') + '\n')
f.write(form.getvalue('gender', '?') + '\n')
f.close()

Using with is more preferred:

with open("abc.txt","w") as f:
    f.write(form.getvalue('firstname', '?') + '\n')
    f.write(form.getvalue('lastname', '?') + '\n')
    f.write(form.getvalue('age', '?') + '\n')
    f.write(form.getvalue('gender', '?') + '\n')

Did you use for to do something like following?

with open("abc.txt", "w") as f:
    for param in ['firstname', 'lastname', 'age', 'gender']:
        f.write(form.getvalue(param, '?') + '\n')

Upvotes: 1

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