📍isalpha : 알파벳인지 확인
a = '1q2w3e4r'
b = '1234'
c = "qwer"
print(a.isdigit()) #False -> 숫자와 섞임
print(b.isdigit()) #True
print(c.isdigit()) #False
📍isdigit : 숫자인지 확인
a = '1q2w3e4r'
b = '1234'
c = "qwer"
print(a.isalpha()) #False -> 알파벳과 섞임
print(b.isalpha()) #False
print(c.isalpha()) #True
📍isalnum : 알파벳 or 숫자인지 확인
a = '1q2w3e4r'
b = '1234'
c = "qwer"
d = "****"
e = '1q2/w3e4r'
print(a.isalnum()) #True
print(b.isalnum()) #True
print(c.isalnum()) #True
print(d.isalnum()) #False -> 특수문자는 false
print(e.isalnum()) #False -> 특수문자와 섞임
Ssancho