IDEL - integrated development environment for Python
Other text editors
http://www.python.org/dev/peps/pep-0008/
https://wiki.python.org/moin/Python2orPython3
# get help information of an imported module
import math
help(math)
FUNCTIONS
acos(...)
acos(x)
Return the arc cosine (measured in radians) of x.
acosh(...)
acosh(x)
Return the hyperbolic arc cosine (measured in radians) of x.
Exit help text with typing: q (quit)