From 0f6fb049e224398ae126ca2bf03cfeced8707480 Mon Sep 17 00:00:00 2001
From: mikeqfu <qian.fu@outlook.com>
Date: Fri, 12 Jun 2020 12:53:21 +0100
Subject: [PATCH] integrated download.py into ops.py

---
 pyhelpers/ops.py | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/pyhelpers/ops.py b/pyhelpers/ops.py
index 1d2b874..ad64531 100644
--- a/pyhelpers/ops.py
+++ b/pyhelpers/ops.py
@@ -5,11 +5,74 @@
 import inspect
 import itertools
 import math
+import os
 import re
+import time
 import types
 
 import numpy as np
 import pandas as pd
+import tqdm
+
+
+def download_file_from_url(url, path_to_file, wait_to_retry=3600, **kwargs):
+    """
+    Download an object available at the given ``url``.
+    See also [`DFFU-1 <https://stackoverflow.com/questions/37573483/>`_].
+
+    :param url: URL
+    :type url: str
+    :param path_to_file: a full path to which the downloaded object is saved as
+    :type path_to_file: str
+    :param wait_to_retry: a wait time to retry downloading, defaults to ``3600`` (in second)
+    :type wait_to_retry: int, float
+    :param kwargs: optional arguments of `io.open <https://docs.python.org/3/library/functions.html#open>`_
+
+    :Example:
+
+    .. code-block:: python
+
+        from pyhelpers.dir import cd
+
+        wait_to_retry = 3600
+
+        url = 'https://www.python.org/static/community_logos/python-logo-master-v3-TM.png'
+        path_to_file = cd("tests\\images", "python-logo.png")
+
+        download_file_from_url(url, path_to_file, wait_to_retry)
+    """
+
+    import requests
+    import fake_useragent
+
+    headers = {'User-Agent': fake_useragent.UserAgent().random}
+    resp = requests.get(url, stream=True, headers=headers)  # Streaming, so we can iterate over the response
+
+    if resp.status_code == 429:
+        time.sleep(wait_to_retry)
+
+    total_size = int(resp.headers.get('content-length'))  # Total size in bytes
+    block_size = 1024 * 1024
+    wrote = 0
+
+    directory = os.path.dirname(path_to_file)
+    if directory == "":
+        path_to_file = os.path.join(os.getcwd(), path_to_file)
+    else:
+        if not os.path.exists(directory):
+            os.makedirs(directory)
+
+    with open(path_to_file, mode='wb', **kwargs) as f:
+        for data in tqdm.tqdm(resp.iter_content(block_size, decode_unicode=True),
+                              total=total_size // block_size, unit='MB'):
+            wrote = wrote + len(data)
+            f.write(data)
+    f.close()
+
+    resp.close()
+
+    if total_size != 0 and wrote != total_size:
+        print("ERROR, something went wrong!")
 
 
 def confirmed(prompt=None, resp=False, confirmation_required=True):