Writing to file
In Python, we can open a file for different purposes. We can read from a file, we can write to it, or we can even append it to the file. To accomplish these tasks, we need to open the file in different modes. The default mode is
r (read) which we have been using so far. Mode | Operation | Example |
'r' | Read (the default one) | with open('document.txt', 'r') as f: |
'w' | Write | with open('document.txt', 'w') as f: |
'a' | Append | with open('document.txt', 'a') as f: |
'r+' | Read + Write | with open('document.txt', 'r+') as f: |
'x' | Create (error if present) | with open('document.txt', 'x') as f: |
After opening the file with the right mode, we can perform appropriate operations like reading from a file or writing to it. We can write to a file with a
write() function:with open('document.txt', 'w') as f:
f.write('This is a written line\n')
f.write('And the second line!')
f.write('Continuation is here...')After the execution of this program
document.txt will contain two lines (because of the \n at the end of the first string). We could have done the writing with a single write() operation, but for the sake of demonstrating, the above program writes several strings to the opened file in separate write() commands.Challenge
Given two lines in the input, write a program that would output those lines in
output.txt separated by a space.Input | output.txt |
hello
there | hello there |
Constraints
Time limit: 2 seconds
Memory limit: 512 MB
Output limit: 1 MB