计算一个文件夹里面所有文件的大小

import os
pathvar =r"E:\python30\day17\ceshi100"
lst = os.listdir(pathvar)
print(lst)
'''
1.txt
2.txt
ceshi200
'''
#(1) 计算文件的大小
size = 0
for i in lst:
    print(i)
    pathnew = os.path.join(pathvar,i)
    
    if os.path.isfile(pathnew):
        print(i,"[是文件]")
        size += os.path.getsize(pathnew)
    elif os.path.isdir(pathnew):
        print(i,"[是文件夹]")
print(size)

#(2)
def getallsize(pathvar):
    size = 0
    lst = os.listdir(pathvar)
    for i in lst:
        #拼接完整路径
        pathnew = os.path.join(pathvar,i)
        #判断是否是文件
        if os.path.isfile(pathnew):
            size += os.path.getsize(pathnew)
        #判断是不是文件夹
        elif os.path.isdir(pathnew):
            #递归调用，查看嵌套文件夹里面的内容
            size += getallsize(pathnew)
    return size
res = getallsize(pathvar)
print(res)