Python and error checking

Easy to introduce intricate bugs?

no declaration of variables
functions can "eat anything"
No, extensive consistency checks at run time replace the need for strong typing and compile-time checks
Example: sending a string to the sine function, math.sin('t'), triggers a run-time error (type incompatibility)
Example: try to open a non-existing file 
./datatrans1.py qqq someoutfile
Traceback (most recent call last):
  File "./datatrans1.py", line 12, in ?
    ifile = open( infilename, 'r')
IOError:[Errno 2] No such file or directory:'qqq'

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