- int
将字符串转换为数字
a = 123
print(type(a),a)
a = "123"
print(type(a),a)
b = int(a)
print(type(b),b)
num = "0011"
v = int(num,base=16) base的意思是将(通常是一个字符串)按照base进制转换成整数。
print(v)
- bit length
age = 3
1 = 1
2 = 10
3 = 11
4 = 100
5 = 101
当前数字的二进制,至少用n位表示
r = age.bit_length
字符的"魔法"
test ="sunpengfei"
# 首字母变成大写:
# v = test.capitalize()
# print(v)
#所有字母变小写,casefold 更牛逼一点,很多未知的对相应变成小写
# v1 = test.lower()
# print(v1)
# v2 = test.casefold()
# print(v2)