在python中将元组转换为int

Question

I have a query which returns a tuple and I'm trying to convert the first value from that tuple to a int but it always gives me this error: TypeError: int() argument must be a string, a bytes-like object or a number, not 'tuple'

I don't understand why it's doing this because the returned values looks like this: [(25,)]

Here is the code:

cursor.execute("SELECT temp FROM temperatures WHERE datetimetest = ?", [datenow])
    currentTemp = cursor.fetchall()
    print(currentTemp) # this gives me [(25,)]
    convertedTemp = int(currentTemp[0])

Answer 1

因为[(25,)]实际上是列表中元组内的 int - 所以获取 int 的正确调用将是currentTemp[0][0]

Answer 2

You can convert list of tuples to list of integers

query = "some query that gets list of integers"
cursor.execute(query)
values = cursor.fetchall()

# values now looks like : [(1,), (2,), (3,)] 

i = 0
for v in values:
    values[i] = v[0]
    i += 1

# values now looks like : [1, 2, 3]