[英]Strings from files to tuples in list
I have a text file that looks like this: 我有一个看起来像这样的文本文件:
3 & 221/73 \\\
4 & 963/73 \\\
5 & 732/65 \\\
6 & 1106/59 \\\
7 & 647/29 \\\
8 & 1747/49 \\\
9 & 1923/49 \\\
10 & 1601/41 \\\
6 & 512 \\\
I want to load the pairs of numbers into a list or a dictionary. 我想将数字对加载到列表或字典中。
This is the code I have so far: 这是我到目前为止的代码:
L = []
data1 = data.replace (" \\\\", " ")
data2 = data1.replace(" & "," ")
i=0
a=''
b=''
while data2[i] != None:
if(a==''):
while( data2[i] != '' ):
a=a+data2[i]
i = i + 1
while(data2[i] !=''):
b=b+data2[i]
i = i + 1
L.append((int(a),int(b)))
a=''
b=''
i=i+1
But this is the error I get: 但这是我得到的错误:
"while( data2[i] != '' ): string out of range"
You almost had it, like @Vor mentioned, your conditional statements were the issue. 你几乎拥有它,就像@Vor提到的那样,你的条件陈述是个问题。 Text files don't end with
None
in Python so you can't do data2[i] != ''
and data2[i] != None:
. Python中的文本文件不以
None
结尾,因此您无法执行data2[i] != ''
和data2[i] != None:
。
with open("data.txt") as f:
L=[]
for line in f:
line=line.replace(" \\\\\\", "").strip() #Replace \\\ and strip newlines
a,b=line.split(' & ') #Split the 2 numbers
L.append((int(a),b)) #Append as a tuple
This approach would output a list of tuples, which you asked for: 这种方法会输出一个元组列表,您要求:
>>> L
[(3, '221/73'), (4, '963/73'), (5, '732/65'), (6, '1106/59'), (7, '647/29'), (8, '1747/49'), (9, '1923/49'), (10, '1601/41'), (6, '512')]
Note: In your 3rd last line, when you append to L
, you use int()
on the b
variable. 注意:在第3行的最后一行中,当您附加到
L
,在b
变量上使用int()
。 Since the string is in the form of '221/73'
, its not a valid integer. 由于字符串的形式为
'221/73'
,因此它不是有效的整数。 You could split the string and int()
each individual number, but then it would divide the numbers, which is probably not what you want. 你可以拆分字符串和
int()
每个单独的数字,但然后它会划分数字,这可能不是你想要的。
Here is a solution that is a bit less C-like and looks more like python. 这是一个类似于C的解决方案,看起来更像python。 Without being sure what exactly the output is supposed to look like, a first guess lead me to this solution:
不确定输出应该是什么样子,第一个猜测引导我找到这个解决方案:
result = []
with open("test.txt") as f:
lines = f.readlines()
for l in lines:
l = l.replace('\\', '')
elements = l.split("&")
elements = [x.strip() for x in elements]
result.append((int(elements[0]), elements[1]))
print result
This is the output: 这是输出:
[(3, '221/73'), (4, '963/73'), (5, '732/65'), (6, '1106/59'), (7, '647/29'), (8, '1747/49'), (9, '1923/49'), (10, '1601/41'), (6, '512')]
Note that this is missing error handling, so if the file does not conform to your format, this will probably throw an exception. 请注意,这是缺少错误处理,因此如果文件不符合您的格式,这可能会引发异常。
I think you want to replace data2[i] != ''
and data2[i] != None:
with something like this i < len(data2)
. 我想你要替换
data2[i] != ''
和data2[i] != None:
用这样的东西i < len(data2)
。
Also your code will fail on that line L.append((int(a),int(b)))
because 221/73
is not a valid literal. 此外,您的代码将在该行上失败
L.append((int(a),int(b)))
因为221/73
不是有效的文字。
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