Import error python

Question

In Python, when I use this import statement breze.learn.mlp import iter_minibatches, am getting the following errors.

Here iter_minibatches is a function defined in mlp.py.

Traceback (most recent call last):
  File "/home/vinod/PycharmProjects/MLPonTheano/MLPbreze.py", line 15, in <module>
    from breze.learn.mlp import Mlp, FastDropoutNetwork
  File "/home/vinod/breze/breze/learn/mlp.py", line 22, in <module>
    from breze.learn.base import SupervisedModel
  File "/home/vinod/breze/breze/learn/base.py", line 21, in <module>
    from breze.learn.mlp import iter_minibatches
ImportError: cannot import name iter_minibatches

"Here iter_minibatches is a function defined in mlp.py" -- can you prove it? — Sam
– Sam, Commented Sep 4, 2015 at 14:38
def iter_minibatches(lst, batch_size, dims, n_cycles=False, random_state=None): print 'inside iter mini batches:', lst[0] batches = [minibatches(i, batch_size, d) for i, d in zip(lst, dims)] .... — Vinod prime
– Vinod prime, Commented Sep 4, 2015 at 14:39
breze.learn.mlp is a seperate file where it contains classes and seperate functions — Vinod prime
– Vinod prime, Commented Sep 4, 2015 at 14:40

Martijn Pieters · Accepted Answer · 2015-09-04 14:42:02Z

4

You have a circular import; mlp imports base imports mlp:

# executing mlp.py
  File "/home/vinod/breze/breze/learn/mlp.py", line 22, in <module>
    from breze.learn.base import SupervisedModel
# executing base.py
  File "/home/vinod/breze/breze/learn/base.py", line 21, in <module>
# this tries to import from mlp again, but mlp isn't done yet
    from breze.learn.mlp import iter_minibatches

Any line after the from breze.learn.base import SupervisedModel will not yet have been executed so importing any object defined by those lines will fail.

Avoid circular imports, or if you must have them, delay importing in one of the modules to make sure the objects you need in the other are defined.

edited Sep 4, 2015 at 14:42

answered Sep 4, 2015 at 14:40

Martijn Pieters

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7 Comments

Sam Over a year ago

Good catch @MartijnPieters!

Vinod prime Over a year ago

I am using from breze.learn.mlp import iter_minibatches in base.py and this import from breze.learn.base import SupervisedModel is used in mlp.py... Can you suggest me how to solve it.... I am newbie to python

Vinod prime Over a year ago

@MartijnPieters I am facing this problem only after adding from breze.learn.mlp import iter_minibatches in base.py

Martijn Pieters Over a year ago

@Vinodprime: yes, and that caused the circular import. Do you have to have that import there? Can you reorganise your objects to not have mlp import something from base again?

Vinod prime Over a year ago

@MartijnPieters I have to use iter_minibatches in base.py, so I don't know wat to do

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