浅析Python中的for 循环
Python for 和其他语言一样，也可以用来循环遍历对象，本文章向大家介绍Python for 循环的使用方法和实例，需要的朋友可与参考一下。
一个循环是一个结构，导致第一个程序要重复一定次数。重复不断循环的条件仍是如此。当条件变为假，循环结束和程序的控制传递给后面的语句循环。
for循环：
在Python for循环遍历序列的任何物品，如一个列表或一个字符串，有能力。
for循环语法是：
for iterating_var in sequence: statements(s)
如果一个序列包含一个表达式列表，它是第一个评价。然后，该序列中的第一项分配迭代变量iterating_var。接下来，执行语句块。列表中的每个项目分配到iterating_var，报表块被执行，直到整个序列被耗尽。
注：在Python中，所有的缩进字符空格后的编程结构相同数量的报表，被认为是一个单一的代码块的一部分。 Python使用缩进作为其语句分组的方法。
例子：
#!/usr/bin/python for letter in 'Python': # First Example print 'Current Letter :', letter fruits = ['banana', 'apple', 'mango'] for fruit in fruits: # Second Example print 'Current fruit :', fruit print "Good bye!"
以上将输出结果：
Current Letter : P
Current Letter : y
Current Letter : t
Current Letter : h
Current Letter : o
Current Letter : n
Current fruit : banana
Current fruit : apple
Current fruit : mango
Good bye!
迭代序列指数：
通过遍历每个项目的另一种方法是由序列本身的偏移指数：
例如：
#!/usr/bin/python fruits = ['banana', 'apple', 'mango'] for index in range(len(fruits)): print 'Current fruit :', fruits[index] print "Good bye!"
这将产生以下结果：
Current fruit : banana
Current fruit : apple
Current fruit : mango
Good bye!
在这里，我们采取的len（）的协助下，内置的功能，它提供了tuple中的元素的总数，以及范围（）内置函数给我们的实际顺序遍历。
以上所述是小编给大家介绍的浅析Python中的for 循环的相关知识，非常不错，具有参考借鉴价值，感兴趣的朋友一起学习吧！
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