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Check number of arguments passed to a Bash script
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81
It might be a good idea to use arithmetic expressions if you're dealing with numbers.
if (( $# ...
Looping over a list in Python
... of the number elements in List1.
list1 = [12, 15, 22, 54, 21, 68, 9, 73, 81, 34, 45]
list2 = []
for i in range(1, len(list1)):
change = list1[i] - list1[i-1]
list2.append(change)
Note that while len(list1) is 11 (elements), len(list2) will only be 10 elements because we are starting our for ...
How to use PyCharm to debug Scrapy projects
I am working on Scrapy 0.20 with Python 2.7. I found PyCharm has a good Python debugger. I want to test my Scrapy spiders using it. Anyone knows how to do that please?
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The function to show current file's full path in mini buffer
I need to get the full path of the file that I'm editing with emacs.
12 Answers
12
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Does Android keep the .apk files? if so where?
...ed apps), etc. Note that you may or may not have permission to read these directories depending on your relationship with the other app; however, all apps are able to read the resource .apk (which is also the real .apk for non-forward-locked app).
If you are just poking around in the shell, curren...
Batch script to delete files
I have a batch script as follows.
5 Answers
5
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“No such file or directory” error when executing a binary
I was installing a binary Linux application on Ubuntu 9.10 x86_64. The app shipped with an old version of gzip (1.2.4), that was compiled for a much older kernel:
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Remove folder and its contents from git/GitHub's history
...emove the refs to the old commits
# (repeat these two commands for as many directories that you want to remove)
git filter-branch --index-filter 'git rm -rf --cached --ignore-unmatch DIRECTORY_NAME/' --prune-empty --tag-name-filter cat -- --all
git for-each-ref --format="%(refname)" refs/original/ |...
What are the Ruby File.open modes and options?
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Casimir et Hippolyte
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answered Sep 10 '10 at 5:13
Daniel O'HaraDa...
Show the progress of a Python multiprocessing pool imap_unordered call?
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81
There is no need to access private attributes of the result set:
from __future__ import divisi...