Reverse for loop using range() Nested for loops While loop inside for loop for loop in one line Accessing the index in for loop Iterate String using for loop Iterate List using for loop Iterate Dictionary using for loop What is for loop in Python In Python, the for loop is used to iter...
# Remove all occurrences in List using While Loop mylist = [21, 5, 8, 52, 21, 87] r_item = 21 # remove the item for all its occurrence while r_item in mylist: mylist.remove(r_item) print(mylist) 1. 2. 3. 4. 5. 6. 7. 执行和输出: 7. 列表循环遍历 可以使用 for 循环...
Think of how you can loop through a string or array of characters backwards to produce a new string. def FirstReverse(str): # code goes here return str # keep this function call here print FirstReverse(raw_input()) 二、解法:切片 A simple way to reverse a string would be to create a...
# Print the obtained permutations foriinlist(perm): print(i) 输出: (1,2,3) (1,3,2) (2,1,3) (2,3,1) (3,1,2) (3,2,1) 它生成 n! 如果输入序列的长度为 n,则排列。 如果想要得到长度为 L 的排列,那么以这种方式实现它。 # A Python program to print all # permutations of give...
The loops in lines 4 and 10 determine the way the algorithm runs through the list. Notice how j initially goes from the first element in the list to the element immediately before the last. During the second iteration, j runs until two items from the last, then three items from the ...
{} movie_ids = list(df[0].values) movie_name = list(df[1].values) for k,v in zip(movie_ids,movie_name): movie_dict[k] = v return movie_dict # Function to create training validation and test data def train_val(df,val_frac=None): X,y = df[['userID','movieID']].values,...
Much similar to strings, we can use the index number to access items in lists as shown below. Example: Python 1 2 3 4 list1 = [1,2,3,4,5] print(list1[1]) #Access the element second element Accessing a List Using Reverse Indexing To access a list in reverse order, we have to...
Reverse a List Using the Slice Operator in Python If you prefer not to loop over the list, then use thesliceoperatorto decrement the array index by 1. Similar torange(), the slice operator accepts three arguments:start,stop, andstep. ...
for i in range(1, n + 1): fact *= i return fact print(factorial(5)) Output: Explanation: Here, the factorial() function calculates the product of all numbers from 1 to n using a loop Function to Reverse a String This function takes a string as input and returns its reverse usin...
Print array in reverse order You can loop through the array in reverse order. Loop will start from array.lenght -1 and end at 0 by step value of 1. 1 2 3 4 5 6 7 8 9 10 11 #Initialize array arrInt = [1, 2, 3, 4, 5]; print("Original array: "); for i in range...