计算文件夹大小

1.使用walk方法

def func():
    import os
    path = r'E:PYTHONOldboyClasscode学习过程代码day24文件'
    result = 0
    file = os.walk(path)
    print(file)
    for a,b,c in file:
        print(a,b,c)
        for item in c:
            memory = os.stat(os.path.join(a,item)).st_size
            result+=memory
    return result
m = func()
print(m)

2.使用lisdir方法

import os
PATH = r'E:PYTHONOldboyClasscode学习过程代码day24文件'
def func():
    total_size = 0
    lis = [PATH]
    while True:
        flag = True
        new_lis = []
        for item in lis:
            item1 = os.listdir(item)
            for each_item1 in item1:
                new_path = os.path.join(item, each_item1)
                if os.path.isfile(new_path):
                    file_size1 = os.path.getsize(new_path)
                    total_size+=file_size1
                else:
                    path = os.path.join(item, new_path)
                    new_lis.append(path)
                    flag = False
        lis = new_lis
        if flag:
            return total_size

result = func()
print(result)

3.lisdir计算文件夹大小（进阶） 

import os

path = r'E:PYTHONOldboyClasscode学习过程代码day24文件'
lis = [path]
total_size = 0
while lis:
    path = lis.pop(0)
    """
    把每一层的路径全部都加到列表中 , 每删除一个求一个文件的大小 , 类似于列表或栈的思想
    """
    for item in os.listdir(path):
        abs_path = os.path.join(path,item)
        if os.path.isfile(abs_path):
            size = os.path.getsize(abs_path)
            total_size += size
        else:
            lis.append(abs_path)
print(total_size)