python学习中遇到问题汇总

对字典组成的列表进行排序
order=sorted(listd,key=operator.itemgetter(“num”))

跳过第一次循环
head=next(table)

获取文件名
取文件的绝对路径os.path.abspath(sys.argv[0])或os.path.abspath(file)
os.path.split(文件绝对路径)，[0]所在文件夹，[1]文件名
split(".")[0]获取去除后缀的文件名

filename=os.path.split(os.path.abspath(sys.argv[0]))[1].split(".")[0]

批量修改路径下CSV文件内容
递归查找目录下所有以.csv结尾的文件，以绝对路径组成列表：
os.listdir(绝对路径)列出文件夹下所有文件
os.path.isdir(绝对路径)判断是否为文件夹，使用相对路径判断，有时会出错
file.endswith(".csv")判断文件是否以.csv结尾
使用replace（old,new）进行文件内容修改
修改后的内容写入新文件
删除老文件os.remove(老文件)
将新文件改名为老文件os.rename(新文件，老文件)

import os
import csv


class csv_replace():
    def __init__(self, old, new, ext):
        self.old = old
        self.new = new
        self.ext = ext
        self.filelist=[]

    def csvtolist(self,data_path):
        files = os.listdir(data_path)
        # print(files)
        for file in files:
            if os.path.isdir(os.path.join(data_path,file)):
                # print(os.listdir(file))
                file1 = data_path + "\\" + file
                self.csvtolist(file1)
            elif file.endswith(self.ext):
                absfile = data_path + "\\" + file
                self.filelist.append(absfile)
        # print(filelist)
        return self.filelist

    def replace_func(self,csvtolist):
        for i in csvtolist:
            with open(i, "r") as file1, open(i + "_new", "w", newline="") as file2:
                table = csv.reader(file1)
                writer = csv.writer(file2)
                for row in table:
                    if self.old == row[1]:
                        row[1] = row[1].replace(self.old, self.new)
                    writer.writerow(row)
            os.remove(i)
            os.rename(i+"_new", i)


if __name__ == "__main__":
    data_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "..")) + "\\datafile\\"
    # old = "com.youdao.note:id/enter_app"
    # new = "com.youdao.note:id/enter_app_new"
    old = "com.youdao.note:id/enter_app_new"
    new = "com.youdao.note:id/enter_app"
    ext = ".csv"
    obj = csv_replace(old, new, ext)
    filelist=obj.csvtolist(data_path)
    obj.replace_func(filelist)

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