python字符串格式化 查找

字符串格式化

方法一
# a = 'Hello, %s' %1111
# b = 'Hi, %s, you have $%s.' % ('Michael',1111)
# print(b)

方法二
# a = 'Hello, {0}, 成绩提升了 {1:.1f}%'.format('小明', 17.125)
# print(a)

方法三
# r = 2.5
# s = 3.14 * r ** 2
# print(f'The area of a circle with radius {r} is {s:.2f}')

# strs = ' $$$1234G33 3GGGqqqqweqqqq '

# print(type('123'))

# 字符串(不可变)

# strs.index 找不到报错

# strs.find 找不到返回-1

# print(strs.find('qqqq'),strs.index('qqqq'))

# a = strs[strs.find('qqqq'):strs.find('qqqq')+len('qqqq')]

# print(a)

# for i in strs[8:12]:

# print(i)

 

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