CODEWITHSUNDEEP
pythonpython-3.x
Mark.S
Mark.S

Reputation: 165

Python, Writing contents of function to .txt file

I am doing some online tutorials with python 3.5 and have learned how to write a string to a file and save it. Now I am trying to write the contents of a function but don't have any luck.

from RECAPS import recap3_1

recap3_1.get_details("Mark", "M", 26)
recap3_1.get_schooling(30000,260,900)

fw = open("Details.txt", "w")
fw.write(recap3_1.get_details("Mark", "M", 26))
fw.close()

I then get this error

Mark Male 26
Traceback (most recent call last):
29360
File "E:/PyProjects/YoutubeProject/RECAPS/recap3.py", line 8, in <module>
fw.write(recap3_1.get_details("Mark", "M", 26))
Mark Male 26
TypeError: write() argument must be str, not None

Process finished with exit code 1

the get_details function is just this,

def get_details(name, gender, age=0):

if age < 18:
    print("You are too young to register")
    return

if len(name) < 2:
    print("Looks like your name is too short")
    return

if gender is "M":
    gender = "Male"
elif gender is "F":
    gender = "Female"
else:
    gender = "Unknown"

print(name, gender, age)

What am I missing. I was hoping to grab the function from another .py file and save the contents

Upvotes: 0

Views: 1510

Answers (3)

Haifeng Zhang
Haifeng Zhang

Reputation: 31925

Based on your post, I can see get_details do print output on console but it can't tell whether it returns anything or not.

def get_details(name, gender, age):
    info = "{0} {1} {2}".format(name, gender, age)
    print(info)  # print on console
    return info  # you have to return a String

Python Input and Output:

f.write(string) writes the contents of string to the file, returning the number of characters written.

>>> f.write('This is a test\n')
>>> 15

Upvotes: 1

Lloyd Kirk
Lloyd Kirk

Reputation: 175

The method you are calling: recap3_1.get_details is returning None, not the value you want to write to file. Just because the values print to the screen does not mean that you are returning these strings when calling the function. Try:

    test_var = recap3_1.get_details("Mark", "M", 26)
    print(test_var)

You should see None print to the screen. If you want the get_details method to return a value to write to file, you have to specify in the method definition.

EDIT: Now that you've posted your code, you need your method to return a string... if you want the values space separated like your printed output, just do:

    return ' '.join((name, gender, age))

instead of the print statement in get_details, and your script should work as expected

Upvotes: 0

yelsayed
yelsayed

Reputation: 5542

It looks like the functions recap3_1.get_details and recap3_1.get_schooling print to stdout directly instead of returning strings, that's why you're getting a None instead of a string. In order to write their result, you need to get their output as a string. Can you modify their code?

Upvotes: 0

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