In Python, we can loop over list elements with for and while statements, and list comprehensions. Python list loop with for Python for statement iterates over the elements of a list in the order that they appear in the list. list_loop_for.py #!/usr/bin/python words = ["cup", "star...
在下面的迭代中,迭代状态和迭代器变量是内部管理的(我们看不到它),使用迭代器对象遍历内置的可迭代对象,如列表,元组,字典等。 # Iterating over a listprint("List Iteration")l=["geeks","for","geeks"]foriinl:print(i)# Iterating over a tuple (immutable)print("\nTuple Iteration")t=("geeks","...
...ifodd(numbers[i]): ... del numbers[i] # BAD: Deleting item from alistwhileiterating over it ... Traceback (most recent call last): File"", line2, in IndexError:listindex out of range 有经验的程序员都知道,在Python中遍历列表或数组时不应该删除该列表(数组)中的元素。虽然上面代码...
... if odd(numbers[i]): ... del numbers[i] # BAD: Deleting item from a list while iterating over it ... Traceback (most recent call last): File "<stdin>", line 2, in <module> IndexError: list index out of range 当迭代的时候,从一个 列表 (List)或者数组中删除元素,对于任何有...
To iterate through a list in Python, the most straightforward method is using aforloop. The syntax is simple:for item in list_name:, whereitemrepresents each element in the list, andlist_nameis the list you’re iterating over. For example, if you have a list of city names likecities ...
# Iterating over the Python args tuple forxinargs: result+=x returnresult print(my_sum(1,2,3)) 这个例子中,你不再需要向my_sum()函数传递一个list。而是传递三个不同的位置参数。my_sum()会获取所有输入的参数,并将它们打包成一个可迭代的简单对象,命名为args。
def SUMListsByArgs(*args): sum_lists = 0 # Iterating over the Python args tuple for a in args: sum_lists += a return sum_lists print(SUMListsByArgs(1, 2, 3, 4, 5, 6)) 21 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
# Iterating over the Python args tuple for x in args: result += x return result print(my_sum(1, 2, 3)) 1. 2. 3. 4. 5. 6. 7. 8. 这个例子中,你不再需要向my_sum()函数传递一个list。而是传递三个不同的位置参数。my_sum()会获取所有输入的参数,并将它们打包成一个可迭代的简单对象...
import ast my_list = ast.literal_eval(expr) 来代替以下这种操作: expr = "[1, 2, 3]"my_list = eval(expr) 我相信对于大多数人来说这种形式是第一次看见,但是实际上这个在Python中已经存在很长时间了。 5. 字符串/数列 逆序 你可以用以下方法快速逆序排列数列: ...
a count (from start which defaults to 0) and the corresponding value obtained from iterating over iter- able. enumerate() is useful for obtaining an indexed series: (0, seq[0]), (1, seq[1]), (2, seq[2]), ... For example: >...