Python Pandas concatenate a Series of strings into one string

问题

In python pandas, there is a Series/dataframe column of str values to combine into one long string:

df = pd.DataFrame({'text' : pd.Series(['Hello', 'world', '!'], index=['a', 'b', 'c'])})

Goal: 'Hello world !'

Thus far methods such as df['text'].apply(lambda x: ' '.join(x)) are only returning the Series.

What is the best way to get to the goal concatenated string?

回答1:

You can join a string on the series directly:

In [3]:
' '.join(df['text'])

Out[3]:
'Hello world !'

回答2:

Apart from join, you could also use pandas string method .str.cat

In [171]: df.text.str.cat(sep=' ')
Out[171]: 'Hello world !'

However, join() is much faster.

来源：https://stackoverflow.com/questions/41400381/python-pandas-concatenate-a-series-of-strings-into-one-string