Python 列表程序不工作
我已经编写了一个python程序来充当购物列表或其他一些列表编辑器。它按原样显示列表,然后询问是否要添加内容,然后询问是否要查看列表的最新版本。代码如下:Python 列表程序不工作,python,Python,我已经编写了一个python程序来充当购物列表或其他一些列表编辑器。它按原样显示列表,然后询问是否要添加内容,然后询问是否要查看列表的最新版本。代码如下: #!/usr/bin/python import sys def read(): f = open("test.txt","r") #opens file with name of "test.txt" myList = [] for line in f: myList.append(line)
#!/usr/bin/python
import sys
def read():
f = open("test.txt","r") #opens file with name of "test.txt"
myList = []
for line in f:
myList.append(line)
print(myList)
myList = []
f.close()
def add_to(str):
newstr = str + "\n"
f = open("test.txt","a") #opens file with name of "test.txt"
f.write(newstr)
f.close()
read()
yes = "yes"
answerone = raw_input("Would you like to add something to the shopping list?")
if answerone == yes:
answertwo = raw_input("Please enter an item to go on the list:")
add_to(bob)
answerthree = raw_input("Would you like to see your modified list?")
if answerthree == yes:
read()
else:
sys.exit()
else:
sys.exit()
当它显示列表时,它将以增加长度的列显示。
而不是它在文本文件中的显示方式:
Shopping List
Soap
Washing Up Liquid
Test List
ball
apple
cat
digger
elephant
它显示如下:
['Shopping List\n']
['Shopping List\n', 'Soap\n']
['Shopping List\n', 'Soap\n', 'Washing Up Liquid\n']
我想知道是否有人能帮助我理解它为什么会这样,以及如何修复它。
仅供参考,我正在使用python 2.6.1
编辑:感谢所有评论和回答的人。我现在正试图编辑代码,使其按字母顺序排序列表,但它不起作用。我已经编写了一段测试代码,试图让它工作(这将在read()函数中):
这是文本文件:
Shopping List
Soap
Washing Up Liquid
Test List
ball
apple
cat
digger
elephant
这是输出:
Enigmatist:PYTHON lbligh$ python test.py
['Test List\n', 'ball\n', 'apple\n', 'cat\n', 'digger\n', 'elephant']
ball
apple
cat
digger
elephant
['apple\n', 'ball\n', 'cat\n', 'digger\n', 'elephant']
同样,任何故障排除都会有所帮助。
谢谢
另外,我现在在read中使用Python2.7.9,您在每行读取后都将打印整个列表。您只需打印当前行:
def read():
f = open("test.txt","r") #opens file with name of "test.txt"
myList = []
for line in f:
myList.append(line)
print(line)
myList = [] # also you are setting it to empty here
f.close()
另外,您应该使用with
语句来确保文件的关闭;而且没有理由使用myList
,因为您还没有返回任何更改;您希望从项目的开头和结尾添加额外的空格,因此最小值为:
def read():
with open('test.txt') as f:
for line in f:
line = line.strip()
print line # this is python 2 print statement
如果需要返回一个值:
def read():
my_list = []
with open('test.txt') as f:
for line in f:
line = line.strip()
my_list.append(line)
print line
return my_list
因为它会将每一行追加到列表中。您应该独立
打印mylist
,这样它就不会在for
循环中