将小写字母更改为：数字00-25，将大写字母更改为：数字26-51

Question

I have already tried a couple different methods and come away with no avail. We need to perform this with simple operators and simple loops. Here is what I have tried:

def str2num(inputstr):
    i = ''

    for x in inputstr:

        i = i + str.replace(x, str(ord(x)),1)
    i = str(i)

    print(i)

Came away with an error stating that in integer cannot be converted to a string implicitly, which I tried to fix with the str(ord(x), but I still received the same error.

Then I decided I would try to convert to a list and use the import string...things got messy:

def str2num(s):

    import string

    r = string.ascii_lowercase + string.ascii_uppercase
    L = list(r)

    for i in L:
        L [i] = 00 + 1

    print(L)

I am out of solutions that I can come up with, any suggestions? Remember (and I know it is a pain, but) simple solutions only. Use for, with, while, if, import string, and general mathematical operators. This class is not about efficiency, but using the basic tools to get the job done.

Thank you.

Answer 1

To get a list of numbers:

In [172]: t='abcABC'

In [175]: l = map(lambda x: ord(x)-97 if x.islower() else ord(x)-65+26, t)

In [176]: l
Out[176]: [0, 1, 2, 26, 27, 28]

To get a string with 1 to '01' :

In [179]: ''.join('%02d'%i for i in l)
Out[179]: '000102262728'

function version:

In [186]: def str2num(s):
     ...:   res=[]
     ...:   for i in s:
     ...:       if i.islower():
     ...:           res.append(ord(i)-97)
     ...:       else:
     ...:           res.append(ord(i)-65+26)
     ...:   return ''.join('%02d'%i for i in res)

In [187]: str2num('MyHome')
Out[187]: '382433141204'

Answer 2

use somestring.islower() and somestring.isUpper()

for lowercase its str(ord(somestring[i])-97) to get 0 - 25 for az

for uppercase str(ord(somestring[i])-65+26) to get 26 - 51 for AZ

i don't know how you want to code it but this should help alot. use ur Ascii table ;)

also this doesn't check for 2 digits so you're gonna need to figure that out too if you want things like 00, 01, etc...