246. Strobogrammatic Number

246. Strobogrammatic Number

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Given a string num which represents an integer, return true if num is a strobogrammatic number.

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down).

Example 1:

Input: num = "69"
Output: true

Example 2:

Input: num = "88"
Output: true

Example 3:

Input: num = "962"
Output: false

Constraints:

• 1 <= num.length <= 50
• num consists of only digits.
• num does not contain any leading zeros except for zero itself.

class Solution:
    def isStrobogrammatic(self, num: str) -> bool:
        myset=set(num)
        for v in ['2','3','4','5','7']:
            if v in myset:return False
        num1=[]
        for v in num[::-1]:
            if v=='6':
                num1.append('9')
            elif v=='9':
                num1.append('6')
            else:
                num1.append(v)
        # print(num/)
        return ''.join(num1)==num