Tuesday, January 14, 2014

Python tip[5]

Tip #5

Meet the triumvirate  of python interactive sessions:

help(), dir(), see()

So no doubt you use help, and probably dir, but you are probably wondering about see()... That's because it has to be installed first:

pip install see

What it does: Unless you speak native dunder (double underscore), dir's output can be a little overwhelming. For example, a dir on an int object (everything is an object in python...) gives us:

>>> dir(1)
['__abs__', '__add__', '__and__', '__class__', '__cmp__', '__coerce__', '__delattr__', '__div__', '__divmod__', '__doc__', '__float__', '__floordiv__', '__format__', '__getattribute__', '__getnewargs__', '__hash__', '__hex__', '__index__', '__init__', '__int__', '__invert__', '__long__', '__lshift__', '__mod__', '__mul__', '__neg__', '__new__', '__nonzero__', '__oct__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdiv__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'conjugate', 'denominator', 'imag', 'numerator', 'real']

>>> from see import see
>>> see(1)
    +           -           *           /           //          %           **
    <<          >>          &           ^           |           +obj
    -obj        ~           <           <=          ==          !=          >
    >=          abs()       bool()      divmod()    float()     hash()
    help()      hex()       int()       long()      oct()       repr()
    str()       .conjugate()            .denominator            .imag
    .numerator  .real

A little more human readable, no? Oh, I'm about to hear the complaint about typing from see import see everytime you start up python. Time to go and check tip #2...



fruch said...

It gets my vote into the stdlib. ( if it was on the table)

Erik Youngren said...

Anyone foresee any problems with using "from see import see as dir" in PYTHONSTARTUP, just replacing dir() with this altogether?