Question

I am having a little trouble with my Python3 code today, I am not sure what I am doing wrong. Here are the instructions:

Lab-8 For today's lab you going to write six functions. Each function will perform reading and/or write to a file Note: In zybooks much like on your computers you can read and write files. Think of zybooks like a computer without any files in it. If you want to test your code that reads a file you first have to write a file to test. The following describes what each function should do: writeToFile(string, filename) This functions takes the name of a file, opens that file, and the writes the string to that file. This function does not need a loop. This function should not return anything. This function will help you see if your other functions are working correctly. Example writeToFile("Hello, World\n", "hello.txt" first file Hello, World\n

and here is my code:

update: I have seen I did not close x in sumFile and I am still only getting a 2/10 on the grader. any help appreciated.

Answer 1

There were some mistakes in your code. Mainly, you were not closing the files once a write operation is performed. One thing to keep in mind is that whenever you open a file, you should close it. Here is the corrected code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

#code

def writeToFile(string,filename):

    with open(filename,'w') as x:

        x.write(string)

        #closing file

        x.close()

def printFile(filename):

    #opening file

    file=open(filename)

    #printing complete file after truncating trailing/leading newline characters

    print(file.read().strip())

    file.close() #closing file

def writeListToFile(l,filename):

    #opening file in write mode

    file=open(filename,'w')

    #looping and writing each number to file, followed by a newline character

    for num in l:

        file.write(str(num)+'\n')

    file.close() #closing file to save everything

def writeUserInfo(name,password,filename):

    #opening file in append mode

    file=open(filename,'a+')

    #appending name and password in the mentioned format

    file.write('name='+name+'\n')

    file.write('password='+password+'\n')

    file.close()#closing file to save everything

def sumFile(filename):

    sum=0

    file=open(filename)

    #looping through each line

    for line in file:

        #converting line to int

        num=int(line.strip())

        #adding to sum

        sum+=num

    #closing file and returning sum

    file.close()

    return sum

def nameInFile(name, filename):

    file=open(filename)

    for line in file:

       #stirpping newline character from line and checking if line equals name=<name>

        if line.strip()=='name='+name:

            return True

    file.close()

    return False

def main():

    writeToFile("Hello, World\n","hello.txt")

    printFile("hello.txt")

    writeListToFile([1,2,3,4],"myfile.txt")

    printFile("myfile.txt")

    writeUserInfo("paul","walrus7","secret_file")

    writeUserInfo("dave", "python_is_fun", "secret_file")

    printFile("secret_file")

    print(sumFile("myfile.txt"))

    print(nameInFile('paul','secret_file'))

main()

#output

Hello, World

1

2

3

4

name=paul

password=walrus7

name=dave

password=python_is_fun

10

True