Cannot import name StringIO when importing dateutil

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I'm having a 'Cannot import name StringIO' error message when importing dateutil which tries to import StringIO but cannot find it. Here is complete trace:

(DEV)arbi@el-oued:~/Work/sentimentpy$ python core/main.py
Traceback (most recent call last):
  File "core/main.py", line 7, in <module>
    from io.reader import *
  File "/home/arbi/Work/sentimentpy/core/io/reader.py", line 4, in <module>
    from dateutil import parser
  File "/home/arbi/DEV/local/lib/python2.7/site-packages/dateutil/parser.py", line 22, in <module>
    from io import StringIO
ImportError: cannot import name StringIO

When I tried to use python3 to launch my program, i had this error:

(DEV)arbi@el-oued:~/Work/sentimentpy$ python3 core/main.py
Traceback (most recent call last):
  File "core/main.py", line 1, in <module>
    from analyzer.length import LengthAnalyzer
  File "/home/arbi/Work/sentimentpy/core/analyzer/length.py", line 4, in <module>
    from numpy
ImportError: No module named numpy

Why I'm having this? i've installed numpy in my virtualenv with: pip install numpy

asked 30 secs ago

Arbi

122

Cannot import name StringIO when importing dateutil