file.writelines() expects an iterable of strings. It then proceeds to loop and call file.write() for each string in the iterable. In Python, the method does this: def writelines(self, lines) for line in lines: self.write(line) You are passing in a single large string, and a string is an iterable of strings too. When iterating you get … Read more
A bit more idiomatic. For PrintWriter, this example: File(“somefile.txt”).printWriter().use { out -> history.forEach { out.println(“${it.key}, ${it.value}”) } } The for loop, or forEach depends on your style. No reason to use append(x) since that is basically write(x.toString()) and you already give it a string. And println(x) basically does write(x) after converting a null to “null”. … Read more
First of all you are opening file in read mode and trying to write into it. Consult – IO modes python Secondly, you can only write a string or bytes to a file. If you want to write a dictionary object, you either need to convert it into string or serialize it. import json # … Read more
The most obvious way to do this would be to print to a file object: with open(‘out.txt’, ‘w’) as f: print(‘Filename:’, filename, file=f) # Python 3.x print >> f, ‘Filename:’, filename # Python 2.x However, redirecting stdout also works for me. It is probably fine for a one-off script such as this: import sys orig_stdout = … Read more
It depends on how correct you want to be. \n will usually do the job. If you really want to get it right, you look up the newline character in the os package. (It’s actually called linesep.) Note: when writing to files using the Python API, do not use the os.linesep. Just use \n; Python … Read more