Write Numbers to a File | Simple Tutorial | #Shorts

This python tutorial for beginners explains how to write numbers from a text file. The code includes opening the file using ‘w’ for write to file, converting the numbers from integers to strings, writing the string to the file with a newline character added if we want each number on a new line. If the file exists already this will delete all the contents so beware when you write to a file. If you want to use an existing file and add to that file, then use append. The code is identical with the exception of the ‘a’ flag use rather than ‘w’.
We start off with the numbers 1, 2, 3 and 4 in a list and the file name to which we want to write these numbers . We then use the open function in python to open the file and use the ‘w’ flag to indicate that we are writing to a file rather than reading to a file. As with reading files it is our preference to use a file handle and ‘with’ that will not only open the file but also close automatically.
We need to produce just strings to put into the file therefore we need to convert any numbers to strings. We can do this by looping through the list and converting each number to a string. In this video we create a string called ‘out’ and the write that string to the file. As stated above, if it is your wish to have each number on a new line then you can add the new line character to this ‘out’ string. This will write each number on a new line in the file.
Finally, we change the code to using an ‘a’ flag in the open function. This ‘a’ stands for append. In this code the file is opened but the contents are not deleted, the new text is added to the end of the existing contents. The code is identical to writing to a file in all other ways.

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