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How to group dataframe rows into list in pandas groupby?
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12 Answers
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How to convert a Binary String to a base 10 integer in Java
...without leading zeroes) that I want to convert to their corresponding base 10 numbers. Consider:
9 Answers
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How can I parse a string with a comma thousand separator to a number?
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16 Answers
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how to set “camera position” for 3d plots using python/matplotlib?
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164
By "camera position," it sounds like you want to adjust the elevation and the azimuth angle th...
how to convert from int to char*?
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129
In C++17, use std::to_chars as:
std::array<char, 10> str;
std::to_chars(str.data(), st...
Convert floats to ints in Pandas?
...mns=['a'])
df.a = df.a.astype(float)
df
Out[33]:
a
0 0.0000000
1 1.0000000
2 2.0000000
3 3.0000000
4 4.0000000
pd.options.display.float_format = '{:,.0f}'.format
df
Out[35]:
a
0 0
1 1
2 2
3 3
4 4
shar...
How can I obtain the element-wise logical NOT of a pandas Series?
...: s = pd.Series([True, True, False, True])
In [8]: ~s
Out[8]:
0 False
1 False
2 True
3 False
dtype: bool
Using Python2.7, NumPy 1.8.0, Pandas 0.13.1:
In [119]: s = pd.Series([True, True, False, True]*10000)
In [10]: %timeit np.invert(s)
10000 loops, best of 3: 91.8 µs per loop
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How to check if a number is a power of 2
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1251
There's a simple trick for this problem:
bool IsPowerOfTwo(ulong x)
{
return (x & (x...
How to print number with commas as thousands separators?
I am trying to print an integer in Python 2.6.1 with commas as thousands separators. For example, I want to show the number 1234567 as 1,234,567 . How would I go about doing this? I have seen many examples on Google, but I am looking for the simplest practical way.
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Select random row from a sqlite table
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216
Have a look at Selecting a Random Row from an SQLite Table
SELECT * FROM table ORDER BY RANDOM...