26.22 Python格式化字符串

https://scz.617.cn/python/201911141329.txt

A:

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#
# 传统方案
#
name    = "nonexist"
age     = 83
email   = "nonexist@evil.org"
out     = """
name    : %s
age     : %d
email   : %s
""" % ( name, age, email )
print( out )
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name    = "nonexist"
age     = 83
email   = "nonexist@evil.org"
out     = '''
name    : {name}
age     : {age}
email   : {email}
'''.format( name=name, age=age, email=email )
print( out )
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name    = "nonexist"
age     = 83
email   = "nonexist@evil.org"
out     = '''
name    : {0}
age     : {1}
email   : {2}
'''.format( name, age, email )
print( out )
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#
# 后面的方案只适用于Python3
#
name    = "nonexist"
age     = 83
email   = "nonexist@evil.org"
out     = f'''
name    : {name}
age     : {age}
email   : {email}
'''
print( out )
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name    = "nonexist"
age     = 83
email   = "nonexist@evil.org"
out     = '''
name    : {name}
age     : {age}
email   : {email}
'''.format_map( vars() )
print( out )
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class sth :
    def __init__ ( self, name, age, email ) :
        self.name   = name
        self.age    = age
        self.email  = email

x       = sth( "nonexist", 83, "nonexist@evil.org" )
out     = '''
name    : {name}
age     : {age}
email   : {email}
'''.format_map( vars( x ) )
print( out )
--------------------------------------------------------------------------