打卡帖 告别拖延症～

MAX = sys.maxsize
float('inf')
float('-inf')

python: isdigit(), isalpha, isalnum()

print('Salary: ', person.get('salary'))

takeaway, input got in as string, so alway remember to convert them into integers

rowNumber = input()
sum = 0
for i in range(int(rowNumber)):
    row = input().split()
    sum += int(row[i])
    #print(row[i])

print(sum)

when you do .extend,
the input should be a list

also, check sometimes if you mistake == for =
it will compile and it will run, but it will fail

print([['A'] * 10 ])
print([['A'] for _ in range(10)])

[['A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A']]
[['A'], ['A'], ['A'], ['A'], ['A'], ['A'], ['A'], ['A'], ['A'], ['A']]

all() function can be very handy     


def win(self, board, token):
      n = len(board)
      
      for j in range(n):
        if all(board[i][j] == token for i in range(n)): return True
        if all(board[j][i] == token for i in range(n)): return True
      
      if all(board[i][i] == token for i in range(n)):return True
      
      if all(board[n - 1 - i][i] == token for i in range(n)):return True
      
      return False

n = int(input())

result = 100.00
height = 100.00
for i in range(n - 1):
    result += height
    height /= 2

print(f'{result:.2f}')

UCLA34 发表于 2021-9-12 02:13
n = int(input())

result = 100.00

Round to second digit after decimal

Second, a dictionary key must be of a type that is immutable. For example, you can use an integer, float, string, or Boolean as a dictionary key. However, neither a list nor another dictionary can serve as a dictionary key, because lists and dictionaries are mutable. Values, on the other hand, can be any type and can be used more than once.