Explanation: In the exercise above the code defines a function named "string_reverse()" that takes a string as input and returns its reversed version using a while loop and string manipulation. The final print statement demonstrates the result of calling the "string_reverse()" function with the...
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...
In the second loop, you use the .keys() method to iterate over the keys. While both approaches are equivalent, the first one is more commonly used, whereas the second might be more readable and explicit.In both loops, you can access the dictionary values using the keys:...
Dictionaries maintain the order of their items in insertion order, and you can loop over them in reverse by using the reversed function, even though they're not sequences.reversed returns an iteratorThe reversed function accepts a reversible iterable, and it returns an iterator (a lazy iterable...
test_string='Python Programming'string_reversed=test_string[-1::-1]print(string_reversed)string_reversed=test_string[::-1]print(string_reversed)# String reverse logically defstring_reverse(text):r_text=''index=len(text)-1whileindex>=0:r_text+=text[index]index-=1returnr_textprint(string_re...
string x = "This is a string."; 或者int x = 5; 注意有关字符串的更多信息,请参阅本章后面的“字符串”一节。当你告诉 Pythonx = 4的时候,python“知道”了x是一个int(整数)。尽管是动态类型的,Python 是强类型的。这意味着它会抛出一个错误,而不是允许你做一些事情,比如给一个string添加一个int...
len("This is a string") # => 16 我们可以在字符串前面加上f表示格式操作,并且在格式操作当中也支持运算。不过要注意,只有Python3.6以上的版本支持f操作。 # You can also format using f-strings or formatted string literals (in Python 3.6+) ...
def reverse_string(string): return string[::-1] 17、将数字与数字进行求和 将数字与数字进行求和,这是一个非常简单的问题,我们可以用传统方法解决这个问题: def sum_a_num(num): sum = 0 while num > 0: sum+= num%10 num//=10 return sum 这是可以的,但在紧张的情况下,最终可能会与运算符发生...
list.reverse()和list.sort()分别表示原地倒转列表和排序(注意,元组没有内置的这两个函数)。 reversed()和sorted()同样表示对列表/元组进行倒转和排序,reversed()返回一个倒转后的迭代器(上文例子使用list()函数再将其转换为列表);sorted()返回排好序的新列表。 列表和元组存储方式的差异 前面说了,列表和元组最...
string_reversed = test_string[-1::-1] print(string_reversed) string_reversed = test_string[::-1] print(string_reversed) # String reverse logically def string_reverse(text): r_text = '' index = len(text) - 1 while index >= 0: ...