arguments

format strings and named arguments in Python

烂漫一生 提交于 2020-08-20 19:14:04
问题 Case 1: "{arg1} {arg2}".format (10, 20) It will give KeyError: 'arg1' because I didn't pass the named arguments. Case 2: "{arg1} {arg2}".format(arg1 = 10, arg2 = 20) Now it will work properly because I passed the named arguments. And it prints '10 20' Case 3: And, If I pass wrong name it will show KeyError: 'arg1' "{arg1} {arg2}".format(wrong = 10, arg2 = 20) But, Case 4: If I pass the named arguments in wrong order "{arg1} {arg2}".format(arg2 = 10, arg1 = 20) It works... and it prints '20 10

format strings and named arguments in Python

感情迁移 提交于 2020-08-20 19:12:41
问题 Case 1: "{arg1} {arg2}".format (10, 20) It will give KeyError: 'arg1' because I didn't pass the named arguments. Case 2: "{arg1} {arg2}".format(arg1 = 10, arg2 = 20) Now it will work properly because I passed the named arguments. And it prints '10 20' Case 3: And, If I pass wrong name it will show KeyError: 'arg1' "{arg1} {arg2}".format(wrong = 10, arg2 = 20) But, Case 4: If I pass the named arguments in wrong order "{arg1} {arg2}".format(arg2 = 10, arg1 = 20) It works... and it prints '20 10

How this parameter knows the argument

廉价感情. 提交于 2020-08-10 19:16:48
问题 Im confused with how the elem get the value of arr? function lengGreaterThan(num) { function lengGreaterThanNum(elem) { return elem.length > num; } return lengGreaterThanNum; } let arr = ['Justin', 'caterpillar', 'openhome']; console.log(arr.filter(lengGreaterThan(6))); 回答1: That is a really confusing way of writing it, but essentially you are just putting a function that takes one parameter into the filter function. This here would do the same thing: console.log(arr.filter((elem) => { return

Why are non-type template arguments used? [duplicate]

偶尔善良 提交于 2020-08-02 07:58:06
问题 This question already has answers here : Why we use non-type template arguments? (4 answers) Closed 3 years ago . I have read many questions and answers, but this question caught my eye the most; it and its answers are helpful but I still feel that I do not fully understand the uses and the theories behind using non-type template arguments. They provide many useful examples as to when it is used, but none really shed light on the theories behind the non-type template arguments. I am

Why are non-type template arguments used? [duplicate]

自作多情 提交于 2020-08-02 07:57:59
问题 This question already has answers here : Why we use non-type template arguments? (4 answers) Closed 3 years ago . I have read many questions and answers, but this question caught my eye the most; it and its answers are helpful but I still feel that I do not fully understand the uses and the theories behind using non-type template arguments. They provide many useful examples as to when it is used, but none really shed light on the theories behind the non-type template arguments. I am