pandas 来自标准输入的熊猫数据
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Pandas data from stdin
提问by Fra
Is it possible to have stdin data go into a pandas DataFrame?
是否可以将标准输入数据放入 Pandas DataFrame?
Currently I'm saving the data in an intermediate jsonfile and then doing:
目前我将数据保存在一个中间json文件中,然后执行以下操作:
pandas.read_json('my_json_file.json')
but was wondering if it's possible to pipe the stdin directly in the python script. I found this: How to read from stdin or from a file if no data is piped in Python?but not sure how to do a line-by-line insertion in a pandas DF.
但想知道是否可以直接在 python 脚本中通过管道传输标准输入。我发现了这一点:如果在 Python 中没有通过管道传输数据,如何从标准输入或文件中读取?但不确定如何在 Pandas DF 中逐行插入。
回答by Viktor Kerkez
Just use the sys.stdinas a fileobject (which it actually is) and pass it to pandasread_xymethod.
只需将sys.stdin用作file对象(它实际上是)并将其传递给pandasread_xy方法。
$ cat test.py
import sys
import pandas as pd
df = pd.read_json(sys.stdin)
print df
$ cat data.json
{"a": [1,2,3,4], "b":[3,4,5,6]}
$ python test.py < data.json
a b
0 1 3
1 2 4
2 3 5
3 4 6

