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How can I check if character in a string is a letter? (Python)

I know about islower and isupper , but can you check whether or not that character is a letter? For Example: 6 Answers ...
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Argparse optional positional arguments?

...arguments: dir optional arguments: -h, --help show this help message and exit -v share | improve this answer | follow | ...
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Joda-Time: what's the difference between Period, Interval and Duration?

... are defined e.g. this might be the interval between 20:00:00GMT yesterday and 09:00:00GMT this morning. A duration in Joda-Time represents a duration of time measured in milliseconds. The duration is often obtained from an interval. i.e. we can subtract start from end of an interval to derive a du...
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What does the “~” (tilde/squiggle/twiddle) CSS selector mean?

Searching for the ~ character isn't easy. I was looking over some CSS and found this 5 Answers ...
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Pip freeze vs. pip list

...ments.txt The packages need to be in a specific format for pip to understand, which is feedparser==5.1.3 wsgiref==0.1.2 django==1.4.2 ... That is the "requirements format". Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x). If you do not specify ==1.4....
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Why are we not to throw these exceptions?

... Exception is the base type for all exceptions, and as such terribly unspecific. You shouldn’t ever throw this exception because it simply does not contain any useful information. Calling code catching for exceptions couldn’t disambiguate the intentionally thrown excep...
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Unique combination of all elements from two (or more) vectors

... this maybe what you are after > expand.grid(a,b) Var1 Var2 1 ABC 2012-05-01 2 DEF 2012-05-01 3 GHI 2012-05-01 4 ABC 2012-05-02 5 DEF 2012-05-02 6 GHI 2012-05-02 7 ABC 2012-05-03 8 DEF 2012-05-03 9 GHI 2012-05-03 10 ABC 2012-05-04 11...
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C# - Multiple generic types in one list

... +1 just because you are showing how to use it (DataType and object Data helped a lot) – Odys Dec 26 '11 at 19:04 4 ...
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A simple command line to download a remote maven2 artifact to the local repository?

...en to build their applications, but is likely somewhat familiar with maven and probably has it installed. 3 Answers ...
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Angularjs if-then-else construction in expression

... answered May 16 '13 at 11:16 Andre GoncalvesAndre Goncalves 3,81022 gold badges1818 silver badges1515 bronze badges ...