Jul 20, 2012 · You can iterate over lines in a file object in Python by iterating over the file object itself: for line in f: copy.write(line) From the docs on file objects: An alternative approach to reading lines is to loop over the file object. This is memory efficient, fast, and leads to simpler code: >>> for line in f: print line,

Dec 17, 2013 · This uses the input file object as an iterable, looping directly over the open file object with for line in fin. Once a matching line is found, the nested while loop reads more lines from the same file object, until a line with ) is found.

Jan 17, 2024 · You can usually easily and safely do copy-pasting with IPython, through the commands %cpaste (manually ending code with --) and %paste (execute code immediately). This is very handy for testing code that you copy from web pages, for instance, or from your editor: these commands even strip leading prompts (like In[1] and ...

Feb 21, 2025 · shutil.copy () method in Python is used to copy the content of the source file to destination file or directory. Output: Explanation: shutil.copyfile (‘first.txt’, ‘second.txt’) function copies the contents of ‘first.txt’ to ‘second.txt’, replacing any existing content in ‘second.txt’.

Mar 21, 2024 · There are various ways to read specific lines from a text file in python, this article is aimed at discussing them. Method 1: fileobject.readlines () A file object can be created in Python and then readlines () method can be invoked on this object to read lines into a stream.

Aug 6, 2023 · Program to read the contents of a file and copy only the content of odd lines into a new file. By identifying whether the line number is odd or even in Python. Examples: Hello. World. Python. Language. Output : Hello. Python. Explanation: The output file …

Jan 29, 2025 · In the world of Python programming, the ability to work with text code that can be easily copied and pasted is incredibly useful. Whether you're quickly prototyping an idea, sharing code snippets with colleagues, or learning new concepts, understanding how to handle such text code is fundamental.

Dec 17, 2020 · Being able to paste several lines at once is quite convenient when testing ideas and code snippets, especially since if anything goes wrong you get to investigate directly your variables etc.

I am trying to search for 'python' in a file, after hitting first 'python' in a file I want to print the lines before that and break the loop. Here is the code so far with open ('file.txt', 'r') as i, open ('new.txt', 'w') as o: for line in i: if'python' in line: print (line[0:], file = o)

Simply copy the code snippet from your text editor or browser, paste it into the Python interpreter prompt, and press Enter to execute the code. You will see the output right away, allowing you to iterate and refine your code as needed.