我无法理解 Python 中的这段代码，你能帮帮我吗？ [关闭]

Question

我有一个代码分配，但我找不到答案，所以我在网上查了一下。代码是用python编写的。代码绝对正确，但我无法理解。我对python很陌生，所以请帮助我。

问题来了

假设 s 是一串小写字符。

编写一个程序，打印 s 中字母按字母顺序出现的最长子串。例如，如果 s = 'azcbobobegghakl'，那么你的程序应该打印

按字母顺序排列的最长子串是：beggh 在平局的情况下，打印第一个子字符串。例如，如果 s = 'abcbcd'，那么你的程序应该打印

按字母顺序排列的最长子串是：abc

代码是：

    # initialise tracker variables
    maxLen=0
    current=s[0]
    longest=s[0]

    # step through s indices
    for i in range(len(s) - 1):
    if s[i + 1] >= s[i]:
        current += s[i + 1]
        # if current length is bigger update
        if len(current) > maxLen:
            maxLen = len(current)
            longest = current
    else:
        current=s[i + 1]

    i += 1

print ('Longest substring in alphabetical order is: ' + longest)

Answer 1

s="abdhbdwba"

maxLen=0        # sets the current highest length to 0
current=s[0]    # sets the current letter to the first letter (this is the output string)
longest=s[0]    # sets the longest letter to the first letter(just for programming sake)

# step through s indices
for i in range(len(s) - 1): # goes over every letter in the string s except the last letter 
    if s[i + 1] >= s[i]:    # checks if the next letter in the string is greater than (in ascii code) the current letter
        current += s[i + 1] # if it is, adds the next letter to the current value
        if len(current) > maxLen:  # if we've got to a sequence that is larger, just set the max length to the length of the sequance
            maxLen = len(current)   # just lets the max length to the current length
            longest = current       # just sets the longest to the current value
    else:
        current=s[i + 1]    # just sets the current as is

i += 1  # not sure why this is here?

print ('Longest substring in alphabetical order is: ' + longest)    # just prints it out

让我们回顾一些基础知识：

for i in range(x):
    print(i)

将打印 i, i+1, i+2...i+(x - 1)

x = y[i + 1]

x 现在将等于数组中的第 (i + 1) 个索引

len(x)

将输出字符串在x中的长度