字符串常用功能

st = “i`m handsome!”
st2 = st.replace(‘handsome’,‘ugly’)
st = ‘hahaha’
st2 = st.replace(‘ha’,‘he’,2)

str.replace(old,new,count)：修改字符串，count：更换几个

st = “poi01,116.446238,39.940166”
lst = st.split(’,’)

str.split(obj)：拆分字符串，生成列表

lst = [‘poi01’, ‘116.446238’, ‘39.940166’]
m = ‘-’
st = m.join(lst)

str.join()：连接字符串，对象为序列

st = ‘abcdefg’
print(st.startswith(‘a’), st.endswith(‘f’))

str.startswith(“str”) 判断是否以“str”开头；str.endswith (“str”) 判断是否以“str”结尾

st = ‘aBDEAjc kLM’
print(st.upper()) # 全部大写
print(st.lower()) # 全部小写
print(st.swapcase()) # 大小写互换
print(st.capitalize()) # 首字母大写

st = ‘1234567’
print(st.isnumeric()) # 如果 string 只包含数字则返回 True,否则返回 False.

st = ‘DNVAK’
print(st.isalpha())