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Command line progress bar in Java
... Is this really cross-platform ? It will probably behave ok on Windows and Linux, but what about Macs ? I don't have one, so I can't try it...
– Radu Murzea
Jun 8 '13 at 15:04
3
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psycopg2: insert multiple rows with one query
...ues (
cursor, insert_query, data, template=None, page_size=100
)
The pythonic way of doing it in Psycopg 2.6:
data = [(1,'x'), (2,'y')]
records_list_template = ','.join(['%s'] * len(data))
insert_query = 'insert into t (a, b) values {}'.format(records_list_template)
cursor.execute(insert_quer...
Two way/reverse map [duplicate]
I'm doing this switchboard thing in python where I need to keep track of who's talking to whom, so if Alice --> Bob, then that implies that Bob --> Alice.
...
Why do people say that Ruby is slow? [closed]
...s, but the language is very important too. Dynamic languages like Ruby and Python are slower than static typed languages simply because they require lots of type checking at runtime. Monkey patching is cool, but it is expensive.
– Wilson Freitas
Sep 11 at 19:09...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
...are unique) as well as hashable (which strings and other certain immutable python objects are), the most direct and computationally efficient answer uses Python's builtin sets, (which are semantically like mathematical sets you may have learned about in school).
set(x) == set(y) # prefer this if e...
How do I find the MySQL my.cnf location
... - use one of the sample config files provided with MySQL distribution (on Linux - see /usr/share/mysql/*.cnf files and use whichever is appropriate for you - copy it to /etc/my.cnf and then modify as needed).
Also, note that there is also a command line option --defaults-file which may define cust...
Python Matplotlib Y-Axis ticks on Right Side of Plot
...new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f10354397%2fpython-matplotlib-y-axis-ticks-on-right-side-of-plot%23new-answer', 'question_page');
}
);
Post as a guest
...
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
...
@Bhargav it depends on your OS. On Linux, you can do a which git.
– VonC
Jan 29 '16 at 5:52
3
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Principal component analysis in Python
...
Months later, here's a small class PCA, and a picture:
#!/usr/bin/env python
""" a small class for Principal Component Analysis
Usage:
p = PCA( A, fraction=0.90 )
In:
A: an array of e.g. 1000 observations x 20 variables, 1000 rows x 20 columns
fraction: use principal components that...
How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
...