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Python, remove all non-alphabet chars from string
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123
Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, seco...
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...wo arrays to be evaluated in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or ...
How to convert a string of bytes into an int?
...odule to do this:
>>> struct.unpack("<L", "y\xcc\xa6\xbb")[0]
3148270713L
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How do I read image data from a URL in Python?
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In Python3 the StringIO and cStringIO modules are gone.
In Python3 you should use:
from PIL import Image
import requests
from io import BytesIO
response = requests.get(url)
img = Image.open(BytesIO(response.content))
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How to pass a single object[] to a params object[]
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answered Aug 30 '08 at 21:36
Adam WrightAdam Wright
47k1111 gold badges126126 silver badges148148 bronze badges
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ImportError in importing from sklearn: cannot import name check_build
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13 Answers
13
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Why was the arguments.callee.caller property deprecated in JavaScript?
...ion factorial(n) {
return (!(n>1))? 1 : factorial(n-1)*n;
}
[1,2,3,4,5].map(factorial);
// But this snippet will not:
[1,2,3,4,5].map(function(n) {
return (!(n>1))? 1 : /* what goes here? */ (n-1)*n;
});
To get around this, arguments.callee was added so we could do:
[1,2,3...
What does ~~ (“double tilde”) do in Javascript?
... because the bitwise operators implicitly convert their operands to signed 32-bit integers. This works whether the operands are (floating-point) numbers or strings, and the result is a number.
In other words, it yields:
function(x) {
if(x < 0) return Math.ceil(x);
else return Math.floor(x);...