Solution for 478.

solution/0400-0499/0478.Generate Random Point in a Circle/README.md

@@ -51,6 +51,18 @@ solution.randPoint ();//返回[0.36572,0.17248]</pre>
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```python
+class Solution:
+    def __init__(self, radius: float, x_center: float, y_center: float):
+        self.radius = radius
+        self.x_center = x_center
+        self.y_center = y_center
+
+    def randPoint(self) -> List[float]:
+        length = math.sqrt(random.uniform(0, self.radius**2))
+        degree = random.uniform(0, 1) * 2 * math.pi
+        x = self.x_center + length * math.cos(degree)
+        y = self.y_center + length * math.sin(degree)
+        return [x, y]
 
 ```
 

solution/0400-0499/0478.Generate Random Point in a Circle/README_EN.md

@@ -46,6 +46,18 @@ solution.randPoint(); // return [0.36572, 0.17248]
 ### **Python3**
 
 ```python
+class Solution:
+    def __init__(self, radius: float, x_center: float, y_center: float):
+        self.radius = radius
+        self.x_center = x_center
+        self.y_center = y_center
+
+    def randPoint(self) -> List[float]:
+        length = math.sqrt(random.uniform(0, self.radius**2))
+        degree = random.uniform(0, 1) * 2 * math.pi
+        x = self.x_center + length * math.cos(degree)
+        y = self.y_center + length * math.sin(degree)
+        return [x, y]
 
 ```
 

solution/0400-0499/0478.Generate Random Point in a Circle/Solution.py

@@ -0,0 +1,12 @@
+class Solution:
+    def __init__(self, radius: float, x_center: float, y_center: float):
+        self.radius = radius
+        self.x_center = x_center
+        self.y_center = y_center
+
+    def randPoint(self) -> List[float]:
+        length = math.sqrt(random.uniform(0, self.radius**2))
+        degree = random.uniform(0, 1) * 2 * math.pi
+        x = self.x_center + length * math.cos(degree)
+        y = self.y_center + length * math.sin(degree)
+        return [x, y]