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Pointers in Python?
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answered Jun 24 '10 at 5:58
Alex MartelliAlex Martelli
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How to convert a boolean array to an int array
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176
Numpy arrays have an astype method. Just do y.astype(int).
Note that it might not even be ne...
python dataframe pandas drop column using int
I understand that to drop a column you use df.drop('column name', axis=1). Is there a way to drop a column using a numerical index instead of the column name?
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Rank items in an array using Python/NumPy, without sorting array twice
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11 Answers
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How to convert list of tuples to multiple lists?
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166
The built-in function zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), ...
How can I pass arguments to a batch file?
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17 Answers
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Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
Unicode与UTF-8互转(C语言实现)1. 基础1.1 ASCII码我们知道, 在计算机内部, 所有的信息最终都表示为一个二进制的字符串. 每一个二进制位(bit)有0和1两种状态, 因此...1. 基础
1.1 ASCII码
我们知道, 在计算机内部, 所有的信息最终都表...
filter for complete cases in data.frame using dplyr (case-wise deletion)
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187
Try this:
df %>% na.omit
or this:
df %>% filter(complete.cases(.))
or this:
libra...
pandas: multiple conditions while indexing data frame - unexpected behavior
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221
As you can see, the AND operator drops every row in which at least one
value equals -1. On ...
Get column index from column name in python pandas
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Sure, you can use .get_loc():
In [45]: df = DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
In [46]: df.columns
Out[46]: Index([apple, orange, pear], dtype=object)
In [47]: df.columns.get_loc("pear")
Out[47]: 2
although to be honest I don't often need this myself. U...