使用 Python 将二维字符列表转换为字符串列表

Question

I aim to convert a 2d character list into an list of strings, whose characters were the individual values of the former lists using Python.

Example:

[['a', 'b', 'c', 'd'],
 ['e', 'f', 'g', 'h']]

Should be returned as

['abcd', 'efgh']

This should be by joining the values of the former lists inside the original list together into one string.

Answer 1

You can try:

>>> data = [["a", "b", "c", "d"], ["e", "f", "g", "h"]]
>>> ["".join(d) for d in data]
['abcd', 'efgh']

Answer 2

You can assign the 2D list (list is the term for an array used in Python):

data = [["a", "b", "c", "d"], ["e", "f", "g", "h"]]

Next you can loop through each list inside the data list and assign the new value to the original value in the list:

idx = 0
for x in data:
    data[idx] = "".join(x)
    idx += 1

This will return the required output.

Full Code:

data = [["a", "b", "c", "d"], ["e", "f", "g", "h"]]
idx = 0
for x in data:
    data[idx] = "".join(x)
    idx += 1

Test your code by adding the following two lines:

print(f'First value in list: {data[0]} and second value in list: {data[1]}')

Explanation:

data = [["a", "b", "c", "d"], ["e", "f", "g", "h"]]

The line of code above assigns the 2D list to a variable to be used on later.

idx = 0

The variable idx is used to assign the required value to each of the former values of the 2D list data . You can also assign each value to a separate list by using the .append method.

for x in data:

This loops through each value (or list) inside of the list data , using the variable x to be referenced as in the code. This can also be done using a while loop.

data[idx] = "".join(x)

This assigns the former value with the index of idx in the list with the new value. This uses the python .join method to connect the values in the list by a "".

To read more about the Python .join method visit:

https://www.w3schools.com/python/ref_string_join.asp

idx += 1

This is used to add 1 to the former value of idx so that it outputs the new index of the next value in the list used in the for loop.

Testing Your Code

print(f'First value in list: {data[0]} and second value in list: {data[1]}')

the above line of code is a simple formatted string that outputs the first data[0] and second data[1] values of the variable data .

I hope this helps you with your coding and understanding your code.

Answer 3

你可以试试这个：

[""join(d) for d in data]

Answer 4

Try this,

>>> data = [['a', 'b', 'c', 'd'], ['e', 'f', 'g', 'h']]
>>> list(map(''.join, data))
['abcd', 'efgh']