TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'
Question
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
1 answers
solution1
1 ACCPTED 2013-10-25 09:22:20
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')
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