连接两个数值以使用pandas创建新列? [英] Concatenate two numerical values to make a new column using pandas?

问题描述

我的数据框中有两列.

var1    var2
01       001

我想创建将它们连接在一起的第三列:

I would like to create a third column that joins them together:

var1    var2    var3
01       001    01001

有人知道该怎么做吗?谢谢！

Does anyone know how to do this? Thank you!

推荐答案

您可以使用+进行简单的并发，而

You can use simple concanecate by + with casting by astype:

df['var3'] = df.var1.astype(str) + df.var2.astype(str)
print df
  var1 var2   var3
0   01  001  01001

如果两列的type均是string，则省略铸造:

If type of both columns is string casting is omited:

print type(df.loc[0,'var1'])
<type 'str'>
print type(df.loc[0,'var2'])
<type 'str'>

df['var3'] = df.var1 + df.var2
print df
  var1 var2   var3
0   01  001  01001

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