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feat: add python solution to lc problem: No.0478 (#1883)

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`@@ -51,6 +51,18 @@ solution.randPoint ();//返回[0.36572,0.17248]</pre>`
`51`	`51`	`<!-- 这里可写当前语言的特殊实现逻辑 -->`
`52`	`52`
`53`	`53`	```python
	`54`	`+class Solution:`
	`55`	`+ def __init__(self, radius: float, x_center: float, y_center: float):`
	`56`	`+ self.radius = radius`
	`57`	`+ self.x_center = x_center`
	`58`	`+ self.y_center = y_center`
	`59`	`+`
	`60`	`+ def randPoint(self) -> List[float]:`
	`61`	`+ length = math.sqrt(random.uniform(0, self.radius**2))`
	`62`	`+ degree = random.uniform(0, 1) * 2 * math.pi`
	`63`	`+ x = self.x_center + length * math.cos(degree)`
	`64`	`+ y = self.y_center + length * math.sin(degree)`
	`65`	`+ return [x, y]`
`54`	`66`
`55`	`67`	```
`56`	`68`

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`@@ -46,6 +46,18 @@ solution.randPoint(); // return [0.36572, 0.17248]`
`46`	`46`	`### Python3`
`47`	`47`
`48`	`48`	```python
	`49`	`+class Solution:`
	`50`	`+ def __init__(self, radius: float, x_center: float, y_center: float):`
	`51`	`+ self.radius = radius`
	`52`	`+ self.x_center = x_center`
	`53`	`+ self.y_center = y_center`
	`54`	`+`
	`55`	`+ def randPoint(self) -> List[float]:`
	`56`	`+ length = math.sqrt(random.uniform(0, self.radius**2))`
	`57`	`+ degree = random.uniform(0, 1) * 2 * math.pi`
	`58`	`+ x = self.x_center + length * math.cos(degree)`
	`59`	`+ y = self.y_center + length * math.sin(degree)`
	`60`	`+ return [x, y]`
`49`	`61`
`50`	`62`	```
`51`	`63`

Lines changed: 12 additions & 0 deletions

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`@@ -0,0 +1,12 @@`
	`1`	`+class Solution:`
	`2`	`+ def __init__(self, radius: float, x_center: float, y_center: float):`
	`3`	`+ self.radius = radius`
	`4`	`+ self.x_center = x_center`
	`5`	`+ self.y_center = y_center`
	`6`	`+`
	`7`	`+ def randPoint(self) -> List[float]:`
	`8`	`+ length = math.sqrt(random.uniform(0, self.radius**2))`
	`9`	`+ degree = random.uniform(0, 1) * 2 * math.pi`
	`10`	`+ x = self.x_center + length * math.cos(degree)`
	`11`	`+ y = self.y_center + length * math.sin(degree)`
	`12`	`+ return [x, y]`

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