localtime()),file=sys.stderr)if__name__=='__main__':startTime=strftime(timeformat,localtime())main()endTime=strftime(timeformat,localtime())fh=open('python.log','a')print("%s\n\tRun time : %s - %s "%\(' '.join(sys.argv),startTime,endTime)...
(是的,这是正确的代码,仔细一看:该else条款属于for循环,不是的if。陈述) 当循环使用,该else条款有更多的共同点与 else一个条款try声明比它认为的 if语句:一个try语句的else时候也不例外条款发生运行和循环的else条款时没有运行break 发生。有关try语句和异常的更多信息,请参阅 处理异常。 该continue声明也是从C...
if后面可以跟一个或多个elif,所有条件都是False时,还可以添加一个else:if x < 0: print('It's negative') elif x == 0: print('Equal to zero') elif 0 < x < 5: print('Positive but smaller than 5') else: print('Positive and larger than or equal to 5') 1. 2. 3. 4. 5. 6. ...
Python有若干内建的关键字进行条件逻辑、循环和其它控制流操作。 if、elif和else if是最广为人知的控制流语句。它检查一个条件,如果为True,就执行后面的语句: x=5ifx>0:print(1)x=x-11 if后面可以跟一个或多个elif,所有条件都是False时,还可以添加一个else: ifx<0:print('It\'s negative')elifx==0:...
if、elif和else if是最广为人知的控制流语句。它检查一个条件,如果为True,就执行后面的语句:if x < 0: print('It's negative') if后面可以跟一个或多个elif,所有条件都是False时,还可以添加一个else:if x < 0: print('It's negative') elif x == 0: print('Equal to zero')...
defcalculate_interest(principle, time rate):ifprinciple >0:return(principle * time * rate) /100else:returnNonedefcalculate_interest(principle, time rate):ifprinciple <0:returnNonereturn(principle * time * rate) /100 首选使用“”。以()和""开始。端点() ...
['addr'])) find_flag = 1 break #else: #print("查无此人") #p判断是否找到了 if find_flag==0: print("查无此人") def save_2_file(): """把已经添加的信息保存到文件中""" #f = open("backup.data","w") f = open("backup.data", "w") #f.write(str(card_infors) f.write(...
a comment aboutthiscode:#1someCode()# Here is a lengthier block comment that spans multiple lines using #2# several single-line commentsina row.# #3# These are knownasblock comments.ifsomeCondition:# Here is a comment about some other code:#4someOtherCode()# Here is an inline comment....
If a statement does not include an assignment (with an =), it is printed onto an Out line. In MATLAB, you would need to include a semicolon to suppress the output even from assignment statements, but that is not necessary in Python. On input lines 3, 4, and 5, the Variable explorer...
forlineinopen(file.txt):...forwordinline.split():...ifword.endswith(ing):...print(word)这段程序演示了Python的一些主要特征。首先,使用空格缩进代码,从而使if后面的代码都在前面一行for语句的范围之内;这保证了检查单词是否以ing结尾的测试对所有单词都进行。第二,Python是面向对象语言;每一个...