# => for loop with increment 4.602369500091299 # => for loop with test 4.18337869993411 可以看出,增加的边界检查和自增操作确实大大影响了for循环的执行效率。 前面提到过,Python 底层的解释器和内置函数是用 C 语言实现的。而 C 语言的执行效率远大于 Python。 对于上面的求等差数列之和的操作,借助于 Python...
defmain():print('while loop\t\t',timeit.timeit(while_loop,number=1))print('for loop\t\t',timeit.timeit(for_loop,number=1))print('for loop with increment\t\t',timeit.timeit(for_loop_with_inc,number=1))print('for loop with test\t\t',timeit.timeit(for_loop_with_test,number=1))...
print('while loop\t\t', timeit.timeit(while_loop, number=1)) print('for loop\t\t', timeit.timeit(for_loop, number=1)) print('for loop with increment\t\t', timeit.timeit(for_loop_with_inc, number=1)) print('for loop with test\t\t', timeit.timeit(for_loop_with_test, number=...
Aloopis a sequence of instructions that is continually repeated until a certain condition is reached. For instance, we have a collection of items and we create a loop to go through all elements of the collection. Loops in Python can be created withfororwhilestatements. Python for statement Py...
Increment the sequence with 3 (default is 1): forxinrange(2,30,3): print(x) Try it Yourself » Else in For Loop Theelsekeyword in aforloop specifies a block of code to be executed when the loop is finished: Example Print all numbers from 0 to 5, and print a message when the...
etc. As long as the length of the sequence is not reached, it will iterate over that sequence. The for loop contains initialization, the test expression, and the increment/decrement expression in the C language. Whereas in the case of python, we only have to mention the value and the seq...
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timeit.timeit(while_loop,number=1))print('forloop\t\t',timeit.timeit(for_loop,number=1))print('forloopwithincrement\t\t',timeit.timeit(for_loop_with_inc,number=1))print('forloopwithtest\t\t',timeit.timeit(for_loop_with_test,number=1))if__name__=='__main__':main()#...
Current language: R Current language: Python Current language: Scala Current language: Java Current language: Julia Powered By As you can see, you start off the loop with the for keyword. Next, you make use of a variables index and languages, the in keyword, and the range() function ...
In JavaScript, the for loop is used for iterating over a block of code a certain number of times or over the elements of an array. In this tutorial, you will learn about the JavaScript for loop with the help of examples.