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I am generating some numbers(lets say, num) and writing the numbers to output file using outf.write(num).
But compiler is throwing an error:
"outf.write(num) TypeError: argument 1 must be string or read-only character buffer, not int". How can i solve this problem?
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To write an integer to a file, you just have to open a file in write mode, convert the int to a string with str(), and use the write() function. If you want to add an integer to an existing file and append to the file, then you need to open the file in append mode.
Syntax of putw: putw(n, fptr); Where, n is the integer we want to write in a file and fptr is a file pointer.
Writing numbers to files numbers = range(0, 10) filename = "output_numbers. txt" #w tells python we are opening the file to write into it outfile = open(filename, 'w') for number in numbers: outfile. write(str(number)) outfile. close() #Close the file when we're done!
write() only takes a single string argument, so you could do this:
outf.write(str(num)) or
outf.write('{}'.format(num)) # more "modern" outf.write('%d' % num) # deprecated mostly Also note that write will not append a newline to your output so if you need it you'll have to supply it yourself.
Aside:
Using string formatting would give you more control over your output, so for instance you could write (both of these are equivalent):
num = 7 outf.write('{:03d}\n'.format(num)) num = 12 outf.write('%03d\n' % num) to get three spaces, with leading zeros for your integer value followed by a newline:
007 012 format() will be around for a long while, so it's worth learning/knowing.
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