Speed up import type (0.05 s to 0.02 s) by lazy loading requests

pooch/core.py

@@ -14,8 +14,6 @@
 import shlex
 import shutil
 
-import requests
-import requests.exceptions
 
 from .hashes import hash_matches, file_hash
 from .utils import (
@@ -757,6 +755,8 @@ def stream_download(url, fname, known_hash, downloader, pooch=None, retry_if_fai
     will retry the download the specified number of times in case the failure
     was due to a network error.
     """
+    import requests.exceptions  # pylint: disable=C0415
+
     # Ensure the parent directory exists in case the file is in a subdirectory.
     # Otherwise, move will cause an error.
     if not fname.parent.exists():

pooch/downloaders.py

@@ -11,8 +11,6 @@
 import sys
 import ftplib
 
-import requests
-
 from .utils import parse_url
 
 try:
@@ -191,6 +189,9 @@ def __call__(self, url, output_file, pooch, check_only=False):
             is available on the server. Otherwise, returns ``None``.
 
         """
+        # Lazy import requests to speed up import time
+        import requests  # pylint: disable=C0415
+
         if check_only:
             response = requests.head(url, allow_redirects=True)
             available = bool(response.status_code == 200)
@@ -648,6 +649,9 @@ def doi_to_url(doi):
         The URL of the archive in the data repository.
 
     """
+    # Lazy import requests to speed up import time
+    import requests  # pylint: disable=C0415
+
     # Use doi.org to resolve the DOI to the repository website.
     response = requests.get(f"https://doi.org/{doi}")
     url = response.url
@@ -745,6 +749,9 @@ def download_url(self, file_name):
         download_url : str
             The HTTP URL that can be used to download the file.
         """
+        # Lazy import requests to speed up import time
+        import requests  # pylint: disable=C0415
+
         article_id = self.archive_url.split("/")[-1]
         # With the ID, we can get a list of files and their download links
         article = requests.get(f"https://zenodo.org/api/records/{article_id}").json()
@@ -803,6 +810,8 @@ def download_url(self, file_name):
         download_url : str
             The HTTP URL that can be used to download the file.
         """
+        # Lazy import requests to speed up import time
+        import requests  # pylint: disable=C0415
 
         # Use the figshare API to find the article ID from the DOI
         article = requests.get(
@@ -846,6 +855,8 @@ def initialize(cls, doi, archive_url):
         archive_url : str
             The resolved URL for the DOI
         """
+        # Lazy import requests to speed up import time
+        import requests  # pylint: disable=C0415
 
         # Access the DOI as if this was a DataVerse instance
         parsed = parse_url(archive_url)
@@ -875,6 +886,8 @@ def download_url(self, file_name):
         download_url : str
             The HTTP URL that can be used to download the file.
         """
+        # Lazy import requests to speed up import time
+        import requests  # pylint: disable=C0415
 
         # Access the DOI as if this was a DataVerse instance
         parsed = parse_url(self.archive_url)