"""

The read4 API is already defined for you.

@param buf, a list of characters

@return an integer

def read4(buf):

pass

"""

class Solution:

def read(self, buf, n):

"""

:type buf: List[str], Destination buffer

:type n: int, Maximum number of characters to read

:rtype: int, The number of characters read

"""

if not buf or n <= 0:

return 0

i = 0

k = 4

tmp = [0] * k

while i < n and k == 4:

k = read4(tmp)

j = 0

while i < n and j < k:

buf[j] = tmp[j]

i += 1

j += 1

return i

if __name__ == '__main__':

data = 'abcdferrdsjfklsdjfdsr'

n = len(data)

i = 0

k = 4

def read4(buf):

global i

j = 0

while i < n and j < k:

buf[j] = data[i]

i += 1

j += 1

return j

s = Solution()

res = s.read([0] * 4, 4)

print(res)