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numpy.DataSource.exists
method
DataSource.exists(path)[source]- 
    
Test if path exists.
Test if
pathexists as (and in this order):- a local file.
 - a remote URL that has been downloaded and stored locally in the 
DataSourcedirectory. - a remote URL that has not been downloaded, but is valid and accessible.
 
Parameters: - 
           
path : str - 
           
Can be a local file or a remote URL.
 
Returns: - 
           
out : bool - 
           
True if
pathexists. 
Notes
When
pathis an URL,existswill return True if it’s either stored locally in theDataSourcedirectory, or is a valid remote URL.DataSourcedoes not discriminate between the two, the file is accessible if it exists in either location. 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.DataSource.exists.html