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Allowed characters in Linux environment variable names
...ME COMMAND
1 root 0:00 /bin/sh
12 root 0:00 ps aux
Use python to verify environemnt variable
apk add python
python -c 'import os; print(os.environ["spring.application_name"])'
OUTPUT is happy-variable-name.
What happen?
Shell call builtin exec
Shell builtin exec call syscal...
How do I access the command history from IDLE?
...dentally, why don't you try a better (less ugly, for starters) shell like bpython or ipython?
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nosetests is capturing the output of my print statements. How to circumvent this?
...
python3.5 -m "nose" --nocapture
– Alex Punnen
Mar 19 '18 at 9:24
1
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Sort a list by multiple attributes?
...Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use sort instead of using sorted and then reassigning:
s.sort(key = operator.itemgetter(1, 2))
...
Remove the first character of a string
...
python 2.x
s = ":dfa:sif:e"
print s[1:]
python 3.x
s = ":dfa:sif:e"
print(s[1:])
both prints
dfa:sif:e
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sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and t
... treated as the input sequence. If that string is 74 characters long, then Python sees that as 74 separate bind values, each one character long.
>>> len(img)
74
>>> len((img,))
1
If you find it easier to read, you can also use a list literal:
cursor.execute('INSERT INTO images ...
Why does csvwriter.writerow() put a comma after each character?
...e that behavior. I get 2016-11-05 13:21:11 without quotes. What version of Python are you using?
– Laurence Gonsalves
Nov 5 '16 at 20:26
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Pure JavaScript Send POST Data Without a Form
... data back from a POST request.
JS (put in static/hello.html to serve via Python):
<html><head><meta charset="utf-8"/></head><body>
Hello.
<script>
var xhr = new XMLHttpRequest();
xhr.open("POST", "/postman", true);
xhr.setRequestHeader('Content-Type', 'applic...
How to estimate how much memory a Pandas' DataFrame will need?
...a to the discussion.
I ran a series of tests on this issue.
By using the python resource package I got the memory usage of my process.
And by writing the csv into a StringIO buffer, I could easily measure the size of it in bytes.
I ran two experiments, each one creating 20 dataframes of increasi...
Django queries - id vs pk
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id is also a built-in function in Python, I prefer to use pk because of that.
– Thierry Lam
Oct 23 '10 at 14:05
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