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[英]How do I draw a reverse triangle using characters and nested while loops in Python code?
[英]how can i reverse a list as well as its string elements using python using nested for loops?
我已經嘗試如下,它可以使用列表理解來完成[也不需要使用內置函數和技術,如 [::-1] ],但是想使用如下嵌套的 for 循環來完成嗎?
l=['temp','test']
l1=[]
for t in l:
for i in t:
l1.append(str(i[::-1]))
print(l1)
input: ['test','temp']
required output : ['pmet','tset']
為了顛倒列表中元素的順序,可以使用reverse:
for i in reversed(array):
print(i)
或者,您可以使用array.reverse()
。
為了反轉每個字符串,您可以使用[::-1]
,例如:
txt = "Hello World"[::-1]
print(txt)
輸出:
dlroW olleH
查看您添加的代碼,您可以執行以下操作:
l=['temp','test']
reverse_l=[]
reverse_l = [item[::-1] for item in l] # This is list comprehensions, you can read about it in the link at the end of the answer
reverse_l.reverse()
print(l)
print(reverse_l)
輸出:
['temp', 'test']
['tset', 'pmet']
沒有列表理解的解決方案:
l=['temp','test']
reverse_l=[]
for item in l:
item = item[::-1]
reverse_l.append(item)
reverse_l.reverse()
print(l)
print(reverse_l)
使用嵌套循環:
l=['temp','test']
print([''.join([w[i] for i in range(len(w)-1, -1, -1)]) for w in reversed(l)])
輸出:
['pmet', 'tset']
嘗試這個
l=['temp','test']
l1=[]
for t in l:
l1.append(t[::-1])
print(l1)
您不需要嵌套循環:
l = ['temp', 'test']
l1 = [
word[::-1]
for word in l
]
print(l1)
輸出:
['pmet', 'tset']
您可以嘗試以下操作:
input_list = ['test', 'temp']
input_list.reverse()
print(list(map(lambda x: x[::-1], input_list)))
for i in range(len(l)):
l[i] = l[i][::-1]
l = l[::-1]
您不需要嵌套循環來獲得所需的輸出。
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