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

Because you imported scipy  not sparse  Try from scipy import sparse

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

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

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

[python] Why does this AttributeError in python occur?

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