Why does this AttributeError in python occur

Question

There is one thing  that I do not understand   Why does this  import scipy   happens with several other modules  too  I took scipy as an example now     matrix   scipy sparse coo matrix some params    produce this error   AttributeError   module  object has no attribute  sparse

User · Answer

The default namespace in Python is    main     When you use import scipy  Python creates a separate namespace as your module name  The rule in Pyhton is  when you want to call an attribute from another namespaces you have to use the fully qualified attribute name

User · Answer

This happens because the scipy module doesn t have any attribute named sparse  That attribute only gets defined when you import scipy sparse   Submodules don t automatically get imported when you just import scipy  you need to import them explicitly  The same holds for most packages  although a package can choose to import its own submodules if it wants to   For example  if scipy   init   py included a statement import scipy sparse  then the sparse submodule would be imported whenever you import scipy

User · Answer

AttributeError is raised when attribute of the object is not available   An attribute reference is a primary followed by a period and a name      attributeref      primary     identifier   To return a list of valid attributes for that object  use dir    e g    dir scipy    So probably you need to do simply  import scipy sparse

User · Answer

Because you imported scipy  not sparse  Try from scipy import sparse

[python] Why does this AttributeError in python occur?

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