我一直在尝试使用python 3.6中的Tqdm模块设置进度条,但似乎我已经到了一半.

我的代码如下：

from tqdm import tqdm
import requests
import time

url = 'http://alpha.chem.umb.edu/chemistry/ch115/Mridula/CHEM%20116/documents/chapter_20au.pdf'

# Streaming, so we can iterate over the response.
r = requests.get(url, stream=True)
#Using The Url as a filename
local_filename = url.split('/')[-1]
# Total size in bytes.
total_size = int(r.headers.get('content-length', 0))
#Printing Total size in Bytes
print(total_size)

#TQDM
with open(local_filename, 'wb') as f:
    for data in tqdm(r.iter_content(chunk_size = 512), total=total_size, unit='B', unit_scale=True):
        f.write(data)

问题是,当我在r.iter_content中插入chunk_size = 512时,进度条在显示下载数据时根本不加载,但是当我完全删除chunk_size = 512并且将括号留空时,条形加载就像它一样应该但下载速度太可怕了.

我在这做错了什么？

解决方法:

你并不遥远,但只是遗漏了几乎所有的代码,以使进度条相应地工作.假设您已经创建了界面,这是我用于进度条的方法.它会下载文件并将其保存在桌面上(但您可以指定要保存的位置).它只需要下载文件的大小并将其除以总文件大小,然后使用该值来更新进度条.如果此代码有帮助,请告诉我：

url = 'http://alpha.chem.umb.edu/chemistry/ch115/Mridula/CHEM%20116/documents/chapter_20au.pdf'
save = 'C:/Users/' + username + "/Desktop/"    
r = requests.get(url, stream=True)
total_size = int(r.headers["Content-Length"])
downloaded = 0  # keep track of size downloaded so far
chunkSize = 1024
bars = int(fileSize / chunkSize)
print(dict(num_bars=bars))
with open(filename, "wb") as f:
    for chunk in tqdm(r.iter_content(chunk_size=chunkSize), total=bars, unit="KB",
                                  desc=filename, leave=True):
        f.write(chunk)
        downloaded += chunkSize  # increment the downloaded
        prog = ((downloaded * 100 / fileSize))
        progress["value"] = (prog)  # *100 #Default max value of tkinter progress is 100

return

进度=进度条