Re: [PLUG] Help With Python String Replacement

A little search led me here:

https://sceweb.sce.uhcl.edu/helm/WEBPAGE-Python/documentation/howto/regex/node8.html

After messing about with IPython for a little bit, I came up with the following helpful demonstration using Python "raw" strings that you can see here:

https://i.imgur.com/pQsIjYY.png

It's still damned confusing. Notice there is a difference between how IPython displays string literals that it's just given and how the print function displays them, which is as intended, and what you will get in standard output or error or in an output file. (I tested the latter claim just now and can confirm it is true). Oh, also for anyone who might want text for search purposes, it's small enough to include here I think without Pastebin or the like:

In [53]: test = r'\\ \,'
In [54]: print(test)
\\ \,
In [55]: print(test.replace(r'\\', '\\'))
\ \,
In [56]: test = test.replace(r'\\', '\\')
In [57]: print(test.replace(r'\,', ','))
\ ,
In [58]: test = test.replace(r'\,', ',')
In [59]: print(test)
\ ,

One final style point, just in case: "StringVariable" was formatted with each word capitalized. Typically you're only going to want to use that for user-defined classes (including, say, instances of collections.namedtuple and exceptions). The Google Python style guide offers very succinct advice on what you will usually want to make communication with other Pythonistas (and yourself) easy:

https://google.github.io/styleguide/pyguide.html#316-naming

So, in this instance, you would want to use "snake case" and spell it out as "string_variable", using underscores between lowercase words.

Hope this all helps.

On Wed, Jun 28, 2023 at 1:47 PM Casey Bralla via plug <plug@lists.phillylinux.org> wrote:

This should be a no-brainer, but I guess I fit in the category of "no
brain" :)

My python script is looking through a text file and wants to fix some
character strings that contain escape characters.

I want to replace some double-slashes "\\" with single slashes "\". I
also want to replace a slash-comma "\,"with a comma ","

But the python code is getting confused by the slashes as escape
characters. Here's my code.

StringVariable.replace("\\","\")

StringVariable.replace("\,",",")

Can somebody help me with this code snippet?

TIA!

Casey

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