Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python2/cmath.py

@@ -1,18 +1,15 @@
+"""Stub file for the 'cmath' 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 polar(a: complex) -> tuple: pass
-
 def acos(*args, **kwargs) -> complex: pass
 
 def acosh(*args, **kwargs) -> complex: pass
 
-def isnan(a: complex) -> bool: pass
+def asin(*args, **kwargs) -> complex: pass
 
-def sqrt(*args, **kwargs) -> complex: pass
-
-def rect(a: float, b: float) -> complex: pass
+def asinh(*args, **kwargs) -> complex: pass
 
 def atan(*args, **kwargs) -> complex: pass
 
@@ -20,11 +17,13 @@ def atanh(*args, **kwargs) -> complex: pass
 
 def cos(*args, **kwargs) -> complex: pass
 
-def tanh(*args, **kwargs) -> complex: pass
-
 def cosh(*args, **kwargs) -> complex: pass
 
-def sinh(*args, **kwargs) -> complex: pass
+def exp(*args, **kwargs) -> complex: pass
+
+def isinf(a: complex) -> bool: pass
+
+def isnan(a: complex) -> bool: pass
 
 def log(a: complex, *args, **kwargs) -> complex: pass
 
@@ -32,14 +31,16 @@ def log10(*args, **kwargs) -> complex: pass
 
 def phase(a: complex) -> float: pass
 
-def isinf(a: complex) -> bool: pass
+def polar(a: complex) -> tuple: pass
 
-def exp(*args, **kwargs) -> complex: pass
-
-def tan(*args, **kwargs) -> complex: pass
+def rect(a: float, b: float) -> complex: pass
 
 def sin(*args, **kwargs) -> complex: pass
 
-def asin(*args, **kwargs) -> complex: pass
+def sinh(*args, **kwargs) -> complex: pass
 
-def asinh(*args, **kwargs) -> complex: pass
+def sqrt(*args, **kwargs) -> complex: pass
+
+def tan(*args, **kwargs) -> complex: pass
+
+def tanh(*args, **kwargs) -> complex: pass