[英]Adding lists to a new list
I did not get this question right. 我没有正确回答这个问题。 The function
read_words
turns a text file with a bunch of names in new lines into a list and it works. 函数
read_words
将带有一堆新行名称的文本文件转换为列表,并且可以工作。
def read_words(words_file):
""" (file open for reading) -> list of str
Return a list of all words (with newlines removed) from open file
words_file.
Precondition: Each line of the file contains a word in uppercase characters
from the standard English alphabet.
"""
words_list = []
words = words_file.readlines()
for i in range(len(words)):
new_word = words[i]
for char in '\n':
new_word = new_word.replace(char,'')
words_list.append(new_word)
return words_list
the problem arises when I try to get a list of lists 当我尝试获取列表列表时出现问题
def read_board(board_file):
""" (file open for reading) -> list of list of str
Return a board read from open file board_file. The board file will contain
one row of the board per line. Newlines are not included in the board.
"""
board_list = []
row_list = []
rows = read_words(board_file)
for i in range(len(rows)):
for char in rows[i]:
row_list.append(char)
board_list.append(row_list)
return board_list
the goal is to turn a text file of the type: 目标是打开以下类型的文本文件:
ABCD
EFGH
into [['A','B','C','D'],['E','F','G','H']]
变成
[['A','B','C','D'],['E','F','G','H']]
I have already tried playing around with the indices for board_list.append(row_list)
call without luck. 我已经尝试过用
board_list.append(row_list)
调用的索引来运气了。 How can I get this to work? 我该如何工作?
You can do that with a list comprehension and .strip()
like: 您可以使用列表
.strip()
和.strip()
来做到这一点,例如:
def read_board(board_file):
return [list(line.strip()) for line in read_words(board_file)]
def read_words(words_file):
""" (file open for reading) -> list of str
Return a list of all words (with newlines removed) from open file
words_file.
Precondition: Each line of the file contains a word in uppercase characters
from the standard English alphabet.
"""
return [word.strip() for word in words_file.readlines()]
def read_board(board_file):
""" (file open for reading) -> list of list of str
Return a board read from open file board_file. The board file will contain
one row of the board per line. Newlines are not included in the board.
"""
return [list(line) for line in read_words(board_file)]
with open('file1', 'rU') as f:
board = read_board(f)
print(board)
[['A', 'B', 'C', 'D'], ['E', 'F', 'G', 'H']]
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