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How to add an empty column to a dataframe?

python pandas dataframe variable-assignment asked May 1, 2013 at 21:46

stackoverflow.com

517 votes

What should/shouldn't go in .zshenv, .zshrc, .zlogin, .zprofile, .zlogout?

zsh startup asked Apr 4, 2013 at 23:42

unix.stackexchange.com

450 votes

On "familiarity" (or How to avoid "going down the Math Rabbit Hole"?)

soft-question self-learning asked Dec 24, 2013 at 22:08

math.stackexchange.com

296 votes

Can't argue with success? Looking for "bad math" that "gets away with it"

examples-counterexamples recreational-mathematics big-list asked Dec 17, 2012 at 11:51

math.stackexchange.com

284 votes

How to disable margin-collapsing?

css margin asked Oct 31, 2013 at 23:53

stackoverflow.com

194 votes

How to create a new (and empty!) "root" branch?

git asked Feb 22, 2013 at 22:37

stackoverflow.com

181 votes

When is double-quoting necessary?

bash shell shell-script zsh quoting asked Mar 21, 2013 at 14:37

unix.stackexchange.com

99 votes

Idiom for "repeat n times"?

javascript asked Aug 28, 2013 at 23:27

stackoverflow.com

81 votes

How to create an object from an Array of key-value pairs?

javascript asked Nov 18, 2013 at 23:13

stackoverflow.com

78 votes

How portable are /dev/stdin, /dev/stdout and /dev/stderr?

io posix file-descriptors portability asked Apr 13, 2012 at 22:49

unix.stackexchange.com

Top Answers

How to roll back Git repo to first commit and delete all history

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How can a shell function know if it is running within a virtualenv?

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How do I merge two dictionaries in a single expression in Python?

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How: 2D scatterplots with quantitative density-dependent coloring

mathematica.stackexchange.com

How do I pop git stash without triggering an auto-merge?

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Prove that $\gcd(M, N)\cdot \mbox{lcm}(M, N) = M \cdot N$.

math.stackexchange.com

Is every projection continuous?

math.stackexchange.com

What is a "brush"?

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Iterator that supports pushback

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Python practices: arguments passed by "reference"

stackoverflow.com

$X/{\sim}$ is Hausdorff if and only if $\sim$ is closed in $X \times X$

math.stackexchange.com

DNS suddenly broken in Ubuntu VirtualBox

askubuntu.com

What is the difference between "low-hanging fruit" and "firing fish in a barrel"?

english.stackexchange.com

Does philosophy have a dark side?

philosophy.stackexchange.com

What are the most common pitfalls awaiting new users?

mathematica.stackexchange.com

Error in book's definition of open sets in terms of neighborhoods?

math.stackexchange.com

A Young Math Enthusiast's Fear

math.stackexchange.com

What are some good books about Wittgenstein's philosophy of language?

philosophy.stackexchange.com

Which educative video series helps me in learning German?

german.stackexchange.com

How to install numpy in a virtualenv on Debian?

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Karatsuba algorithm too much recursion

stackoverflow.com

Basic Git without the porcelain?

stackoverflow.com

How to get a human-readable dump of .git/index?

stackoverflow.com

Pedagogy: How to cure students of the "law of universal linearity"?

math.stackexchange.com