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Adding 'serial' to existing column in Postgres
I have a small table (~30 rows) in my Postgres 9.0 database with an integer ID field (the primary key) which currently contains unique sequential integers starting at 1, but which was not created using the 'serial' keyword.
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Google Sheets API Setup · App Inventor 2 中文网
...le you got from the Service Account setup steps.
Unable to parse range: ______
If you get this error message, there may be an error with the range that you
provided. This could mean that the sheetName you’ve provided does not actually
exist, or that the reference you provided is not valid A1-...
Programmatically stop execution of python script? [duplicate]
.... From Python's docs:
>>> import sys
>>> print sys.exit.__doc__
exit([status])
Exit the interpreter by raising SystemExit(status).
If the status is omitted or None, it defaults to zero (i.e., success).
If the status is numeric, it will be used as the system exit status.
If it is ...
Syntax error on print with Python 3 [duplicate]
...rror. To avoid this, it is a good practice to import print function:
from __future__ import print_function
Now your code works on both 2.x & 3.x.
Check out below examples also to get familiar with print() function.
Old: print "The answer is", 2*2
New: print("The answer is", 2*2)
Old: print...
Colon (:) in Python list index [duplicate]
... Does not work with dictionaries. applying d[:5] is the eqivalent of d.__getitem__(slice(0, 5, None)). A slice is not hashable.
– Steve Zelaznik
Jul 4 '15 at 2:31
7
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Python - Count elements in list [duplicate]
...:
>>> l = ['a','b','c']
>>> len(l)
3
>>> l.__len__()
3
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Compile (but do not run) a Python script [duplicate]
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py_compile — Compile Python source files
import py_compile
py_compile.compile('my_script.py')
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How do you calculate program run time in python? [duplicate]
...d what you wanted to time): print timeit.timeit('myOwnFunc()', setup='from __main__ import myOwnFunc', number=1). Without the setup parameter, it will complain that it could not find myOwnFunc.
– Landshark666
Dec 24 '12 at 4:13
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Remove duplicate entries using a Bash script [duplicate]
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Perl one-liner similar to @kev's awk solution:
perl -ne 'print if ! $a{$_}++' input
This variation removes trailing whitespace before comparing:
perl -lne 's/\s*$//; print if ! $a{$_}++' input
This variation edits the file in-place:
perl -i -ne 'print if ! $a{$_}++' input
This variation e...
Calling filter returns [duplicate]
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@Mr_and_Mrs_D try putting an iterator object itObj in [] and you will get [itObj], while putting in list() you will get values from object like [1, 4, 7], assuming itObj has these values.
– user2846569
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