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What does Python's eval() do?
In the book that I am reading on Python, it keeps using the code eval(input('blah'))
10 Answers
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Too many 'if' statements?
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@JoeHarper If you want something easy to read, you won't be using magic numbers in the first place and you'll have a comment explaining the mapping. As it is, I prefer this version to the original, but for something maintainable in the long term I'd use an approach ...
Python - write() versus writelines() and concatenated strings
...ites every item.
Edit: Another point you should be aware of:
write() and readlines() existed before writelines() was introduced. writelines() was introduced later as a counterpart of readlines(), so that one could easily write the file content that was just read via readlines():
outfile.writeline...
Export specific rows from a PostgreSQL table as INSERT SQL script
...anywhere with:
COPY other_tbl FROM '/path/to/file.csv';
COPY writes and read files local to the server, unlike client programs like pg_dump or psql which read and write files local to the client. If both run on the same machine, it doesn't matter much, but it does for remote connections.
There i...
Embed git commit hash in a .Net dll
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You can embed a version.txt file into the executable and then read the version.txt out of the executable. To create the version.txt file, use git describe --long
Here are the steps:
Use a Build Event to call git
Right-click on the project and select Properties
In Build Events, add ...
What is the difference between the | and || or operators?
...dition2 | condition3)
This will check conditions 2 and 3, even if 1 is already true. As your conditions can be quite expensive functions, you can get a good performance boost by using them.
There is one big caveat, NullReferences or similar problems. For example:
if(class != null && clas...
IIS AppPoolIdentity and file system write access permissions
...find that you can't. The ApplicationPoolIdentity still needs to be able to read files from the windows system folders (otherwise how else would the worker process be able to dynamically load essential DLL's).
With regard to your observations about being able to write to your c:\dump folder. If you ...
Find full path of the Python interpreter?
...HOSTNAME ~
$ type python
python is hashed (/usr/bin/python)
If you are already in the python shell. Try anyone of these.
Note: This is an alternate way. Not the best pythonic way.
>>>
>>> import os
>>> os.popen('which python').read()
'/usr/bin/python\n'
>>>
>...
Android Writing Logs to text File
...ut then this method creates file but contains nothing. Basically I want to read previous contents of the file and then append my data with the existing content.
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Where are my postgres *.conf files?
... of locate. Imagine these steps: Postgres version x is installed, updatedb reads the location of all files, postgres gets upgarded to version x+1. Now the cached data of locate is too old .... This is not reliable.
– guettli
May 2 '18 at 10:59
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