Python3 将txt数据转换成列表，进行排序，筛选

xujiahui 2021-09-05 原文

Python 程序员需要知道的 30 个技巧

首先是数据：

将上边的四个数据分别写在新建的txt文件中

1、将txt数据转为列表

with open(\'james.txt\') as jaf:
    data = jaf.readline() #读取数据行
    james = data.strip().split(\',\')#将数据转换为列表

with open(\'julie.txt\') as jul:
    data = jul.readline()
    julie = data.strip().split(\',\')

with open(\'sarah.txt\') as sar:
    data = sar.readline()
    sarah = data.strip().split()

方法一

with open(\'james.txt\') as jaf, open(\'julie.txt\') as jul,open(\'sarah.txt\') as sar:
    data = jaf.readline() #读取数据行
    james = data.strip().split(\',\')#将数据转换为列表

    data = jul.readline()
    julie = data.strip().split(\',\')

    data = sar.readline()
    sarah = data.strip().split()

print(james)
print(julie)
print(sarah)

方法二

2、排序：原地排序 james.sort()、复制排序：james2 = james.sorted() 默认升序，降序参数 sort(reverse= True)

由于数据中有-.:, 需要进一步操作

def sanitize(listt):
    if \'-\' in listt:
        splitter = \'-\'
    elif \':\' in listt:
        splitter = \':\'
    else:
        return (listt)
    (mine, sece) = listt.split(splitter)# 分裂字符串   结合字符串
    return (mine + \'.\' + sece)


def returnkist(string):
    with open(string) as jaf:
        data = jaf.readline()  # 读取数据行
        james = data.strip().split(\',\')  # 将数据转换为列表
        clean_james = []
        for ja in james:
            clean_james.append(sanitize(ja))
        clean_james.sort(reverse=True)

        return clean_james

clean = returnkist(\'james.txt\')
print(clean)

方法一

def sanitize(listt):
    if \'-\' in listt:
        splitter = \'-\'
    elif \':\' in listt:
        splitter = \':\'
    else:
        return (listt)
    (mine, sece) = listt.split(splitter)# 分裂字符串   结合字符串
    return (mine + \'.\' + sece)



with open(\'james.txt\') as jaf, open(\'julie.txt\') as jul,open(\'sarah.txt\') as sar:
    data = jaf.readline() #读取数据行
    james = data.strip().split(\',\')#将数据转换为列表

    data = jul.readline()
    julie = data.strip().split(\',\')

    data = sar.readline()
    sarah = data.strip().split()
clean_james = []
for ja in james:
    clean_james.append(sanitize(ja))
clean_james.sort()
print(clean_james)

方法二

3、要返回前三名的成绩

在

def returnkist(string):
    with open(string) as jaf:
        data = jaf.readline()  # 读取数据行
        james = data.strip().split(\',\')  # 将数据转换为列表
        clean_james = [sanitize(s) for s in james]
        clean_james.sort(reverse=True)

        return [clean_james[a] for a in range(3)]
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