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Create Pandas DataFrame from a string
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538
A simple way to do this is to use StringIO.StringIO (python2) or io.StringIO (python3) and pass...
How to use glob() to find files recursively?
...lib.Path.rglob from the the pathlib module, which was introduced in Python 3.5.
from pathlib import Path
for path in Path('src').rglob('*.c'):
print(path.name)
If you don't want to use pathlib, use can use glob.glob('**/*.c'), but don't forget to pass in the recursive keyword parameter and it ...
What's the difference between VARCHAR and CHAR?
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372
VARCHAR is variable-length.
CHAR is fixed length.
If your content is a fixed size, you'll ge...
how to convert array values from string to int?
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edited Apr 23 '19 at 10:46
Rahul
16.8k77 gold badges3434 silver badges5353 bronze badges
a...
How do I loop through a list by twos? [duplicate]
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392
You can use for in range with a step size of 2:
Python 2
for i in xrange(0,10,2):
print(i)...
Group by multiple columns in dplyr, using string vector input
...e so:
data = data.frame(
asihckhdoydkhxiydfgfTgdsx = sample(LETTERS[1:3], 100, replace=TRUE),
a30mvxigxkghc5cdsvxvyv0ja = sample(LETTERS[1:3], 100, replace=TRUE),
value = rnorm(100)
)
# get the columns we want to average within
columns = names(data)[-3]
library(dplyr)
df1 <- data %...
nonlocal keyword in Python 2.x
...turn d['y']
return inner
f = outer()
print(f(), f(), f()) #prints 1 2 3
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Javascript reduce on array of objects
...a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The problem with your example is that you're returning a number literal.
function (a, b) {
return a.x + b.x; // returns number literal
}
Iteration 1: ...
Immutable vs Mutable types
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233
What? Floats are immutable? But can't I do
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut...
Call a function with argument list in python
... func(*args)
def func2(x, y, z):
print x+y+z
wrapper1(func2, 1, 2, 3)
wrapper2(func2, [1, 2, 3])
In wrapper2, the list is passed explicitly, but in both wrappers args contains the list [1,2,3].
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