def capitalize(s, lower_rest=False):
    # print(s)
    # fooBar
    # fooBar

    # print(s.upper())
    # FOOBAR
    # FOOBAR

    # print(s[:1].upper())
    # F
    # F

    # print(s[1:].lower())
    # oobar
    # oobar

    # print(s[1:])
    # ooBar
    # ooBar

    # print(s[:1].upper() + (s[1:].lower() if lower_rest else s[1:]))
    '''
    成立执行的语句 if 条件 else 不成立执行的语句
    '''

capitalize('fooBar')
# FooBar
capitalize('fooBar', True)
# Foobar

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2020-05-03