Import cli.ping in __init__.py

[antalszava]

Context: The cli module contains a ping function to verify the connection to the Xanadu cloud platform. When used in a Python script (and as an option with the command-line interface), an AttributeError is raised.

Description of the Change: Imports cli.ping in __init__.py and adjusts the examples to use sf.ping() for brevity.

Benefits: The ping function can be used from within a Python script after importing strawberryfields:

import strawberryfields as sf
sf.ping()

Possible Drawbacks: Shortening the call to sf.ping() in the examples is less descriptive when compared to sf.cli.ping().

Related GitHub Issues:

338

[codecov[bot]]

Codecov Report

Merging #340 into master will not change coverage by %. The diff coverage is 97.67%.

@@           Coverage Diff           @@
##           master     #340   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files          51       51           
  Lines        6354     6354           
=======================================
  Hits         6208     6208           
  Misses        146      146           

Impacted Files	Coverage Δ
strawberryfields/api/job.py	93.02% <ø> (ø)
strawberryfields/io.py	98.78% <66.66%> (ø)
strawberryfields/api/connection.py	97.70% <100.00%> (ø)
strawberryfields/apps/sample.py	100.00% <100.00%> (ø)
strawberryfields/circuitspecs/X12.py	100.00% <100.00%> (ø)
strawberryfields/circuitspecs/X8.py	100.00% <100.00%> (ø)
strawberryfields/circuitspecs/__init__.py	100.00% <100.00%> (ø)
strawberryfields/engine.py	95.33% <100.00%> (ø)
strawberryfields/program.py	98.84% <100.00%> (ø)
... and 5 more

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