如何在给定起点和终点之间生成 python 中的字符串序列

Question

我想输入作为开始输入，例如 22Ef 和 FFFF 作为结束输入，我想打印这两个输入之间的所有字符串，输出应该是这样的

22Ef
22EA
22EB
.
.
.
FFFE
FFFF

这是我要选择字符的字符串

0123456789abcdefABCDEF

Answer 1

以下（使用 itertools 中的 product 函数）应该有效：

from itertools import product
strings = []
start = "22Ef"
end = "FFFF"
include = False
for i in product("0123456789abcdefABCDEF", repeat=4):
   curstring = "".join(i)
   if curstring == start:
       include = True
   if curstring == end:
        strings.append(curstring)
        break
   if include:
        strings.append(curstring)

print(strings)

Answer 2

此解决方案避免遍历从 0000 到您的起始输入的所有组合：

start = '22Ef'
end = 'FFFF'
characterset = '0123456789abcdefABCDEF'

base = len(characterset)
baseNnumber = [] # little endian list of integers each representing a digit

# find base N representation of start
exponent = 0
startval = 0
for i in start[::-1]:
    digit = characterset.index(i)
    baseNnumber.append(digit)
    startval += digit * base**exponent
    exponent += 1

baseNnumber.extend([0]*(len(end)-len(start)))

# find representation of end
exponent = 0
endval = 0
for i in end[::-1]:
    digit = characterset.index(i)
    endval += digit * base**exponent
    exponent += 1

# number of times to print
increments = endval - startval + 1

for i in range(increments):
    index = 0
    outstr = ''

    # remove leading zeros
    notzero = False
    for i in baseNnumber[::-1]:
        notzero = notzero | (i != 0)
        # add new character to string
        outstr += characterset[i] * notzero

    # the actual printing
    print(outstr)

    # increment baseNnumber by 1
    while True:
        baseNnumber[index] += 1
        if baseNnumber[index] == base:
            baseNnumber[index] = 0
            index += 1
        else:
            break

如果您希望包含前导零，您可能需要用此替换第 34-38 行，因为 notzero 旨在删除它们：

    for i in baseNnumber[::-1]:
        outstr += characterset[i]

或者如果您确定开始和结束输入相同，只需删除第 17 行并进行上面的替换，因为它旨在解决开始和结束输入长度不同的问题。

如何在给定起点和终点之间生成 python 中的字符串序列

how to generate sequence of string in python between given start and end point

python

string

sequence