python获取当前文件和目录路径的方法详解

import sys
import os

if __name__ == "__main__":
    print("__file__ ：", __file__)
    print(os.path.abspath(__file__))
    print(os.path.realpath(__file__))

import sys
import os

if __name__ == "__main__":
    print("第一个参数：", sys.argv[0])
    print(os.path.abspath(sys.argv[0]))
    print(os.path.realpath(sys.argv[0]))

import sys
import os

if __name__ == "__main__":
    print(os.path.dirname(__file__))
    print(os.getcwd())
    print(os.path.abspath('.'))
    print(os.path.abspath(os.curdir))

import sys
import os

if __name__ == "__main__":
    print(os.path.abspath("/home/jovyan/project/pythontest/2/test2.txt"))
    print(os.path.realpath("/home/jovyan/project/pythontest/2/test2.txt"))

import sys
import os

if __name__ == "__main__":
    for i in os.listdir(os.path.dirname(__file__)):
        print("1级目录：", i)
        if os.path.isdir(os.path.join(os.path.dirname(__file__), i)):
            for j in os.listdir(os.path.join(os.path.dirname(__file__), i)):
                print("2级目录：", j)
                print(os.path.abspath(j))      # 这里j不是一个完整路径，只是一个文件名，结果会返回一个错误的'绝对路径'
                print(os.path.realpath(j))
                print(os.path.abspath(os.path.join(os.path.dirname(__file__), i, j)))
                print(os.path.realpath(os.path.join(os.path.dirname(__file__), i, j)))

import sys
import os

if __name__ == "__main__":
    print("==> before:")
    print(sys.path)
    sys.path.insert(0, os.path.dirname(__file__))   #将当前文件目录插入在path搜索路径的第一个位置
    sys.path.append(os.path.dirname(__file__))  #将当前文件目录添加在path搜索路径的最后
    print("==> after:")
    print(sys.path)