import string
print string.ascii_lowercase # abcdefghijklmnopqrstuvwxyz
print type(string.ascii_lowercase) # <type str >
print string.ascii_lowercase is str # False
是否应当使用<条码>。
import string
print string.ascii_lowercase # abcdefghijklmnopqrstuvwxyz
print type(string.ascii_lowercase) # <type str >
print string.ascii_lowercase is str # False
是否应当使用<条码>。
<代码>is的操作者比较了两个物体的特性。 这是我相信的幕后情况:
id(string.ascii_lowercase) == id(str)
实际体积总是与“<代码>>>>>> > 代码/代码”不同,因此永远为<代码>。 False 。
这里是检验某些东西是否是一种扼杀的最残酷方式:
isinstance(string.ascii_lowercase, basestring)
这将与<代码>str和unicode
strings匹配。
使用:
>>> isinstance( dfab , str)
True
http://www.ohchr.org。
www.un.org/Depts/DGACM/index_spanish.htm 真正代码>。
The is
keywordeck Object identity, not category.
您可能看到像<代码>foo”这样的代码,但常常认为<代码>None是一种类型。 <代码>None实际上是单一吨物体。
您希望<条码>类型(显示.ascii_downcase)是《?
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