Remove -> None for Python functions

docs/chapter_computational_complexity/space_complexity.md

@@ -314,7 +314,7 @@
 === "Python"
 
     ```python title=""
-    def algorithm(n: int) -> None:
+    def algorithm(n: int):
         a = 0               # O(1)
         b = [0] * 10000     # O(1)
         if n > 10:
@@ -461,7 +461,7 @@
         # do something
         return 0
 
-    def loop(n: int) -> None:
+    def loop(n: int):
         """循环 O(1)"""
         for _ in range(n):
             function()

docs/chapter_computational_complexity/time_complexity.md

@@ -48,7 +48,7 @@ $$
 
     ```python title=""
     # 在某运行平台下
-    def algorithm(n: int) -> None:
+    def algorithm(n: int):
         a = 2      # 1 ns
         a = a + 1  # 1 ns
         a = a * 2  # 10 ns
@@ -226,14 +226,14 @@ $$
 
     ```python title=""
     # 算法 A 时间复杂度：常数阶
-    def algorithm_A(n: int) -> None:
+    def algorithm_A(n: int):
         print(0)
     # 算法 B 时间复杂度：线性阶
-    def algorithm_B(n: int) -> None:
+    def algorithm_B(n: int):
         for _ in range(n):
             print(0)
     # 算法 C 时间复杂度：常数阶
-    def algorithm_C(n: int) -> None:
+    def algorithm_C(n: int):
         for _ in range(1000000):
             print(0)
     ```
@@ -443,7 +443,7 @@ $$
 === "Python"
 
     ```python title=""
-    def algorithm(n: int) -> None:
+    def algorithm(n: int):
         a = 1      # +1
         a = a + 1  # +1
         a = a * 2  # +1
@@ -644,7 +644,7 @@ $$
 === "Python"
 
     ```python title=""
-    def algorithm(n: int) -> None:
+    def algorithm(n: int):
         a = 1      # +0（技巧 1）
         a = a + n  # +0（技巧 1）
         # +n（技巧 2）