英文:
Is there a python equivalent of ['A'..'Z'] in turbo pascal
问题
在 Turbo Pascal 中,可以使用以下表示方式快速创建包含并介于 'A' 和 'Z' 之间所有元素的列表:['A'..'Z']。
英文:
Like the topic, is there a (quick) way, possibly a notation, to achieve the same effect as in turbo pascal to rapid make a list of all elements containing and between 'A' and 'Z'.
In turbo pascal it could be written as ['A'..'Z']
答案1
得分: 3
import string
print(string.ascii_uppercase)
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
x = list(string.ascii_uppercase)
print(x)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
英文:
I think the most elegant, simple and pythonic way is to use string
module:
import string
print(string.ascii_uppercase)
>>> 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
x = list(string.ascii_uppercase)
print(x)
>>> ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
答案2
得分: 2
不幸的是,在Python中没有其他更简洁、优雅的方法来完成这个任务。正如@Soren所说,对于字母,您可以使用 string.ascii_uppercase
或 string.ascii_lowercase
,然后进行切片。例如,print(string.ascii_uppercase[3:7])
将打印 "DEFG"。
如果您想要更通用、更易读,并且不局限于拉丁字母表字母,您必须编写一个类来实现您想要的功能。
我编写了这个非常简单的示例作为概念验证(它忽略了许多细节)。它应该适用于任何可迭代对象(尽管我只是用字符串进行了测试)。
class Slicer:
def __init__(self, content):
self.content = content
def __getitem__(self, key: slice):
if key.step is not None:
return self.content[self.content.index(key.start) : self.content.index(key.stop)+1 : key.step]
return self.content[self.content.index(key.start) : self.content.index(key.stop)+1]
def __repr__(self):
return f"Slicer({self.content!r})"
import string
letters = Slicer(string.ascii_uppercase)
print(letters)
# Slicer('ABCDEFGHIJKLMNOPQRSTUVWXYZ')
print(letters["A":"H"])
# ABCDEFGH
print(letters["A":"H":2])
# ACEG
如果您想深入了解,它使用了Python中的 slice
对象,表示对象的序列: https://docs.python.org/3/glossary.html#term-slice
对于数字,您可以直接使用 range()
函数: list(range(1, 7))
返回 [1, 2, 3, 4, 5, 6]
(它还支持步长)。
英文:
Unfortunately, there's no other way to do this in Python that's as compact and elegant. As @Soren said, for letters, you can use string.ascii_uppercase
or string.ascii_lowercase
, on which you can do slicing. For instance, print(string.ascii_uppercase[3:7])
prints "DEFG".
If you want something more generic, more readable, and not limited to latin alphabet letters, you have to write a class to approach what you want.
I wrote this very simple example as a proof of concept (it misses many little details). It should work with any iterable (even though I've only tested it with strings).
class Slicer:
def __init__(self, content):
self.content = content
def __getitem__(self, key: slice):
if key.step is not None:
return self.content[self.content.index(key.start) : self.content.index(key.stop)+1 : key.step]
return self.content[self.content.index(key.start) : self.content.index(key.stop)+1]
def __repr__(self):
return f"Slicer({self.content!r})"
import string
letters = Slicer(string.ascii_uppercase)
print(letters)
# Slicer('ABCDEFGHIJKLMNOPQRSTUVWXYZ')
print(letters["A":"H"])
# ABCDEFGH
print(letters["A":"H":2])
# ACEG
If you want to dig further, it uses the slice
object in Python, representing sequences of objects: https://docs.python.org/3/glossary.html#term-slice
For numbers, you can just use the range()
function: list(range(1, 7))
returns [1, 2, 3, 4, 5, 6]
(it also supports steps).
答案3
得分: 2
你可以在字符编号范围上使用map
函数:
*letters, = map(chr, range(65, 91)) # A-Z
print(letters)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
你可以使用解包操作符将多个范围合并在一起:
*alphanum, = *map(chr, range(65, 91)), "0123456789", *map(chr, range(97, 122))
或者,你也可以创建一个自己的简便函数:
def CHR(a, *b):
return [*map(chr, range(ord(a[0]), ord(a[-1]) + 1))] + (CHR(*b) if b else [])
然后你可以根据需要重复使用它:
codeChars = CHR('A..Z', '-', '0..9')
print(codeChars)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
英文:
You can use map on a range of character numbers:
*letters, = map(chr,range(65,91)) # A-Z
print(letters)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
You can combine multiple ranges using unpacking:
*alphanum, = *map(chr,range(65,91)), *"0123456789", *map(chr,range(97,122))
Alternatively you could create a shorthand function of you own:
def CHR(a,*b):
return [*map(chr,range(ord(a[0]),ord(a[-1])+1))] + (CHR(*b) if b else [])
Which you can reuse as needed:
codeChars = CHR('A..Z','-','0..9')
print(codeChars)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9']
答案4
得分: 0
如果您拥有icu4c和PyICU可用,可以使用Unicode集构建字符列表:
from icu import UnicodeSet
chars = list(UnicodeSet('[A-Z]'))
print(chars)
# ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
使用Unicode集,可以开发更复杂和精密的集合。例如,所有大写拉丁字母:
upper_latin = list(UnicodeSet('[[\p{Lu}] & [\p{Script=Latn}]]'))
英文:
If you have icu4c and PyICU available, it is possible to construct a list of characters using Unicode sets:
from icu import UnicodeSet
chars = list(UnicodeSet('[A-Z]'))
print(chars)
# ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
Using Unicode sets, a lot more sophisticated and complex sets can be developed. For instance, all uppercase Latin script letters:
upper_latin = list(UnicodeSet('[[\p{Lu}] & [\p{Script=Latn}]]'))
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