Question

对于列表中的每一行，我试图将其拆分为由＆＃34; \ t＆＃34;分隔的三个组件，但是此代码不会被＆＃34; t＆＃34;拆分。而是通过信件分割整行。

# Function to load a set of sequences from a given file
# File should be stored as a sequence per line
# Input: File name containing sequences 
# Output: List of all sequences in that file
def LoadSeq(FileName):
    FileIn = open(FileName, "r")
    SeqList = []
    for Line in FileIn:
        Line = Line.rstrip()
        SeqList.append(Line)
    FileIn.close()
    return SeqList

def LineToList(Str):
    Str = Str.rsplit()
    return Str.split("\t")

import math

def CalculateDistance(Lat1, Lon1, Lat2, Lon2):
    Lat1 = float(Lat1)
    Lon1 = float(Lon1)
    Lat2 = float(Lat2)
    Lon2 = float(Lon2)
    nDLat = (Lat1 - Lat2) * 0.017453293
    nDLon = (Lon1 - Lon2) * 0.017453293
    Lat1 = Lat1 * 0.017453293
    Lat2 = Lat2 * 0.017453293
    nA = (math.sin(nDLat/2) ** 2) + math.cos(Lat1) * math.cos(Lat2) * (math.sin(nDLon/2) ** 2 )
    nC = 2 * math.atan2(math.sqrt(nA),math.sqrt( 1 - nA ))
    nD = 6372.797 * nC
    return nD

def LocationCount(FileName, DesiredDistance, DesiredLat, DesiredLong):
    for Line in LoadSeq(FileName):
        LineToList(Line)
        Counter = 0
        CalculateDistance(Seq[1], Seq[2], DesiredLat, DesiredLong)
        if CalculateDistance <= DesiredDistance:
             Counter += 1
    return Counter

NumberInDistance = LocationCount("Mammal.txt", 20, 50.261667, -5.043333)
print(NumberInDistance)

这是我一直在使用的代码，我没有正确地将它拆分或者我是否正在进一步搞乱它？我必须使用Python，如果可能的话，它必须保持与此类似的forrmatting

Answer 1

您首先调用rsplit（未定义特定分隔符）splits the string on any whitespace char。之后，您在列表中调用split（由rsplit返回），这将导致异常。

如果您只想按标签拆分，则必须删除LineToList中的第一行。

def LineToList(Str):
    return Str.split("\t")

Answer 2

在您的函数LineToList中，首先调用.rsplit()，它将字符串参数转换为列表。然后，您继续调用另一个 .split()，这会导致错误，因为您只能在字符串上调用.split()。

相反，请将您的功能更改为：

def LineToList(Str):
    return Str.replace("\t", " ").rsplit()

将'\t'更改为' '，从而使其能够通过.rsplit()进行识别。

>>> def LineToList(Str):
...     return Str.replace("\t", " ").rsplit()
... 
>>> LineToList("hi\tthis\tis\tdata")
['hi', 'this', 'is', 'data']
>>>

函数不会按＆＃34; \ t＆＃34;拆分字符串

2 个答案: