assertEqual(a, b) # checks that a == b

assertIs(a, b) # checks that a is b

解決方法:

使用assertEqual這兩個(gè)對(duì)象不需要是同一類型,它們只需要是相同的值.相比之下,使用assertIs,兩個(gè)對(duì)象需要是同一個(gè)對(duì)象.

斷言的assertEqual測(cè)試,如==運(yùn)算符：

The operators , ==, >=, <=, and != compare the values of two objects. The objects need not have the same type. If both are numbers, they are converted to a common type. Otherwise, objects of different types always compare unequal, and are ordered consistently but arbitrarily.

assertI測(cè)試對(duì)象標(biāo)識(shí)與is相同而不是運(yùn)算符：

The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value.

以上引用均來(lái)自Python文檔部分5.9 Comparisons.

標(biāo)簽：python,unit-testing

來(lái)源： https://codeday.me/bug/20191008/1870437.html

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