Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/math.pyi

@@ -0,0 +1,121 @@
+import sys
+from typing import Iterable, Optional, SupportsFloat, SupportsInt, Tuple, overload
+
+e: float
+pi: float
+if sys.version_info >= (3, 5):
+    inf: float
+    nan: float
+if sys.version_info >= (3, 6):
+    tau: float
+
+def acos(__x: SupportsFloat) -> float: ...
+def acosh(__x: SupportsFloat) -> float: ...
+def asin(__x: SupportsFloat) -> float: ...
+def asinh(__x: SupportsFloat) -> float: ...
+def atan(__x: SupportsFloat) -> float: ...
+def atan2(__y: SupportsFloat, __x: SupportsFloat) -> float: ...
+def atanh(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3,):
+    def ceil(__x: SupportsFloat) -> int: ...
+
+else:
+    def ceil(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 8):
+    def comb(__n: int, __k: int) -> int: ...
+
+def copysign(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+def cos(__x: SupportsFloat) -> float: ...
+def cosh(__x: SupportsFloat) -> float: ...
+def degrees(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 8):
+    def dist(__p: Iterable[SupportsFloat], __q: Iterable[SupportsFloat]) -> float: ...
+
+def erf(__x: SupportsFloat) -> float: ...
+def erfc(__x: SupportsFloat) -> float: ...
+def exp(__x: SupportsFloat) -> float: ...
+def expm1(__x: SupportsFloat) -> float: ...
+def fabs(__x: SupportsFloat) -> float: ...
+def factorial(__x: SupportsInt) -> int: ...
+
+if sys.version_info >= (3,):
+    def floor(__x: SupportsFloat) -> int: ...
+
+else:
+    def floor(__x: SupportsFloat) -> float: ...
+
+def fmod(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+def frexp(__x: SupportsFloat) -> Tuple[float, int]: ...
+def fsum(__seq: Iterable[float]) -> float: ...
+def gamma(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 9):
+    def gcd(*integers: int) -> int: ...
+
+elif sys.version_info >= (3, 5):
+    def gcd(__x: int, __y: int) -> int: ...
+
+if sys.version_info >= (3, 8):
+    def hypot(*coordinates: SupportsFloat) -> float: ...
+
+else:
+    def hypot(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 5):
+    def isclose(a: SupportsFloat, b: SupportsFloat, *, rel_tol: SupportsFloat = ..., abs_tol: SupportsFloat = ...) -> bool: ...
+
+def isinf(__x: SupportsFloat) -> bool: ...
+
+if sys.version_info >= (3,):
+    def isfinite(__x: SupportsFloat) -> bool: ...
+
+def isnan(__x: SupportsFloat) -> bool: ...
+
+if sys.version_info >= (3, 8):
+    def isqrt(__n: int) -> int: ...
+
+if sys.version_info >= (3, 9):
+    def lcm(*integers: int) -> int: ...
+
+def ldexp(__x: SupportsFloat, __i: int) -> float: ...
+def lgamma(__x: SupportsFloat) -> float: ...
+def log(x: SupportsFloat, base: SupportsFloat = ...) -> float: ...
+def log10(__x: SupportsFloat) -> float: ...
+def log1p(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 3):
+    def log2(__x: SupportsFloat) -> float: ...
+
+def modf(__x: SupportsFloat) -> Tuple[float, float]: ...
+
+if sys.version_info >= (3, 9):
+    def nextafter(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 8):
+    def perm(__n: int, __k: Optional[int] = ...) -> int: ...
+
+def pow(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 8):
+    @overload
+    def prod(__iterable: Iterable[int], *, start: int = ...) -> int: ...  # type: ignore
+    @overload
+    def prod(__iterable: Iterable[SupportsFloat], *, start: SupportsFloat = ...) -> float: ...
+
+def radians(__x: SupportsFloat) -> float: ...
+
+if sys.version_info >= (3, 7):
+    def remainder(__x: SupportsFloat, __y: SupportsFloat) -> float: ...
+
+def sin(__x: SupportsFloat) -> float: ...
+def sinh(__x: SupportsFloat) -> float: ...
+def sqrt(__x: SupportsFloat) -> float: ...
+def tan(__x: SupportsFloat) -> float: ...
+def tanh(__x: SupportsFloat) -> float: ...
+def trunc(__x: SupportsFloat) -> int: ...
+
+if sys.version_info >= (3, 9):
+    def ulp(__x: SupportsFloat) -> float: ...