Reformat a Python file to have 4 space indentations

Question

I\'m editing a Python file that uses two spaces for programmatic indents - I prefer 4 spaces. In my .vimrc I have the following settings related to indentation:

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Answer 1

In order to double the number of spaces at the beginning of every line (and only at the beginning):

:%s/^\s*/&&/g

& in replacement pattern is the matched pattern.

Probably it will not have any side-effect for you.