--- /dev/null
+"""Stub file for the 'cmath' module."""\r
+\r
+import sys\r
+from typing import Union, Tuple\r
+\r
+e = ... # type: float\r
+pi = ... # type: float\r
+\r
+_C = Union[float, complex]\r
+\r
+def acos(x: _C) -> complex: ...\r
+def acosh(x: _C) -> complex: ...\r
+def asin(x: _C) -> complex: ...\r
+def asinh(x: _C) -> complex: ...\r
+def atan(x: _C) -> complex: ...\r
+def atanh(x: _C) -> complex: ...\r
+def cos(x: _C) -> complex: ...\r
+def cosh(x: _C) -> complex: ...\r
+def exp(x: _C) -> complex: ...\r
+def isinf(z: _C) -> bool: ...\r
+def isnan(z: _C) -> bool: ...\r
+def log(x: _C, base: _C = ...) -> complex: ...\r
+def log10(x: _C) -> complex: ...\r
+def phase(z: _C) -> float: ...\r
+def polar(z: _C) -> Tuple[float, float]: ...\r
+def rect(r: float, phi: float) -> complex: ...\r
+def sin(x: _C) -> complex: ...\r
+def sinh(x: _C) -> complex: ...\r
+def sqrt(x: _C) -> complex: ...\r
+def tan(x: _C) -> complex: ...\r
+def tanh(x: _C) -> complex: ...\r
+\r
+if sys.version_info >= (3,):\r
+ def isfinite(z: _C) -> bool: ...\r