Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python3/math.py

@@ -0,0 +1,93 @@
+"""Stub file for the 'math' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more percise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+def acos(*args, **kwargs) -> object: pass
+
+def acosh(*args, **kwargs) -> object: pass
+
+def asin(*args, **kwargs) -> object: pass
+
+def asinh(*args, **kwargs) -> object: pass
+
+def atan(*args, **kwargs) -> object: pass
+
+def atan2(*args, **kwargs) -> float: pass
+
+def atanh(*args, **kwargs) -> object: pass
+
+def ceil(*args, **kwargs) -> object: pass
+
+def copysign(*args, **kwargs) -> float: pass
+
+def cos(*args, **kwargs) -> object: pass
+
+def cosh(*args, **kwargs) -> object: pass
+
+def degrees(*args, **kwargs) -> float: pass
+
+def erf(*args, **kwargs) -> float: pass
+
+def erfc(*args, **kwargs) -> float: pass
+
+def exp(*args, **kwargs) -> object: pass
+
+def expm1(*args, **kwargs) -> object: pass
+
+def fabs(*args, **kwargs) -> object: pass
+
+def factorial(*args, **kwargs) -> long:
+    raise ValueError()
+
+def floor(*args, **kwargs) -> object: pass
+
+def fmod(*args, **kwargs) -> float: pass
+
+def frexp(*args, **kwargs) -> tuple: pass
+
+def fsum(*args, **kwargs) -> float:
+    raise OverflowError()
+    raise ValueError()
+
+def gamma(*args, **kwargs) -> float: pass
+
+def hypot(*args, **kwargs) -> float: pass
+
+def isfinite(*args, **kwargs) -> bool: pass
+
+def isinf(*args, **kwargs) -> bool: pass
+
+def isnan(*args, **kwargs) -> bool: pass
+
+def ldexp(a: float, b) -> float:
+    raise TypeError()
+
+def lgamma(*args, **kwargs) -> float: pass
+
+def log(*args, **kwargs) -> float: pass
+
+def log10(*args, **kwargs) -> float: pass
+
+def log1p(*args, **kwargs) -> object: pass
+
+def log2(*args, **kwargs) -> float: pass
+
+def modf(*args, **kwargs) -> tuple: pass
+
+def pow(*args, **kwargs) -> float: pass
+
+def radians(*args, **kwargs) -> float: pass
+
+def sin(*args, **kwargs) -> object: pass
+
+def sinh(*args, **kwargs) -> object: pass
+
+def sqrt(*args, **kwargs) -> object: pass
+
+def tan(*args, **kwargs) -> object: pass
+
+def tanh(*args, **kwargs) -> object: pass
+
+def trunc(*args, **kwargs) -> object:
+    raise TypeError()