如何在Python中将逗号分隔的字符串转换为列表？

Question

给定一个由逗号分隔的多个值组成的序列：

mStr = 'A,B,C,D,E' 

如何将字符串转换为列表？

mList = ['A', 'B', 'C', 'D', 'E']

Answer 1

您可以使用 str.split 方法。

>>> my_string = 'A,B,C,D,E'
>>> my_list = my_string.split(",")
>>> print my_list
['A', 'B', 'C', 'D', 'E']

如果您想将其转换为元组，

>>> print tuple(my_list)
('A', 'B', 'C', 'D', 'E')

如果您想附加到列表，请尝试以下操作：

>>> my_list.append('F')
>>> print my_list
['A', 'B', 'C', 'D', 'E', 'F']

Answer 2

对于字符串中包含整数的情况，如果您想避免将它们单独转换为 int，您可以这样做：

mList = [int(e) if e.isdigit() else e for e in mStr.split(',')]

它称为列表理解，它基于关于集合构建器符号。

前任：

>>> mStr = "1,A,B,3,4"
>>> mList = [int(e) if e.isdigit() else e for e in mStr.split(',')]
>>> mList
>>> [1,'A','B',3,4]

Answer 3

为了处理空字符串的情况，请考虑以下事项：

>>> my_string = 'A,B,C,D,E'
>>> my_string.split(",") if my_string else []
['A', 'B', 'C', 'D', 'E']
>>> my_string = ""
>>> my_string.split(",") if my_string else []
[]

Answer 4

您可以将该字符串拆分为 , 并直接获取列表：

mStr = 'A,B,C,D,E'
list1 = mStr.split(',')
print(list1)

输出：

['A'、'B'、'C'、'D'、'E']

您还可以将其转换为 n 元组：

print(tuple(list1))

输出：

('A', 'B', 'C', 'D', 'E')

Answer 5

>>> some_string='A,B,C,D,E'
>>> new_tuple= tuple(some_string.split(','))
>>> new_tuple
('A', 'B', 'C', 'D', 'E')

Answer 6

您可以使用此函数将逗号分隔的单个字符串转换为列表 -

def stringtolist(x):
    mylist=[]
    for i in range(0,len(x),2):
        mylist.append(x[i])
    return mylist

Answer 7

#splits string according to delimeters 
'''
Let's make a function that can split a string
into list according the given delimeters. 
example data: cat;dog:greff,snake/
example delimeters: ,;- /|:
'''
def string_to_splitted_array(data,delimeters):
    #result list
    res = []
    # we will add chars into sub_str until
    # reach a delimeter
    sub_str = ''
    for c in data: #iterate over data char by char
        # if we reached a delimeter, we store the result 
        if c in delimeters: 
            # avoid empty strings
            if len(sub_str)>0:
                # looks like a valid string.
                res.append(sub_str)
                # reset sub_str to start over
                sub_str = ''
        else:
            # c is not a deilmeter. then it is 
            # part of the string.
            sub_str += c
    # there may not be delimeter at end of data. 
    # if sub_str is not empty, we should att it to list. 
    if len(sub_str)>0:
        res.append(sub_str)
    # result is in res 
    return res

# test the function. 
delimeters = ',;- /|:'
# read the csv data from console. 
csv_string = input('csv string:')
#lets check if working. 
splitted_array = string_to_splitted_array(csv_string,delimeters)
print(splitted_array)