How can I resolve TypeError with StringIO in Python 2.7?

问题

Trying to read following string as file using StringIO but getting the error below. How can I resolve it?

>> from io import StringIO
>>>
>>> datastring = StringIO("""\
... Country  Metric           2011   2012   2013  2014
... USA     GDP               7      4     0      2
... USA     Pop.              2      3     0      3
... GB      GDP               8      7     0      7
... GB      Pop.              2      6     0      0
... FR      GDP               5      0     0      1
... FR      Pop.              1      1     0      5
... """)
Traceback (most recent call last):
  File "<stdin>", line 9, in <module>
TypeError: initial_value must be unicode or None, not str

回答1:

You can resolve the error by simply adding a u before your string to make the string unicode:

datastring = StringIO(u"""\
Country  Metric           2011   2012   2013  2014
USA     GDP               7      4     0      2
USA     Pop.              2      3     0      3
GB      GDP               8      7     0      7
GB      Pop.              2      6     0      0
FR      GDP               5      0     0      1
FR      Pop.              1      1     0      5
""")

Your initial value should be unicode.

回答2:

Rather use (fixes this exact issue for me):

from StringIO import StringIO

来源：https://stackoverflow.com/questions/22316333/how-can-i-resolve-typeerror-with-stringio-in-python-2-7