Python - 仅使用循环删除空格

Question

我想仅使用for/while循环和if语句删除字符串中的额外空格;没有拆分/替换/加入。

像这样：

mystring = 'Here is  some   text   I      wrote   '

while '  ' in mystring:
    mystring = mystring.replace('  ', ' ')

print(mystring)

输出

Here is some text I wrote

这是我尝试过的。不幸的是，它不太有效。

def cleanupstring(S):
    lasti = ""
    result = ""

    for i in S:
        if lasti == " " and i == " ":
            i = ""

        lasti = i    
        result += i    

    print(result)


cleanupstring("Hello      my name    is    joe")

输出

Hello   my name  is  joe

我的尝试不会删除所有额外的空格。

Answer 1

将您的代码更改为：

    for i in S:
        if lasti == " " and i == " ":
            i = ""
        else:
            lasti = i    
        result += i    

    print(result)

Answer 2

检查当前字符和下一个字符是否为空格，如果不是，请将它们添加到干净的字符串中。在这种情况下确实不需要and，因为我们正在比较相同的值

def cleanWhiteSpaces(str):
  clean = ""
  for i in range(len(str)):
    if not str[i]==" "==str[i-1]:
      clean += str[i]
  return clean

Answer 3

使用result的末尾代替lasti：

def cleanupstring(S):
    result = S[0]

    for i in S[1:]:
        if not (result[-1] == " " and i == " "):
            result += i

    print(result)


cleanupstring("Hello      my name    is    joe")

Answer 4

只需尝试

t =“你好，我叫乔”

“” .join（t.split（））

这将输出

“你好，我叫乔”