Replace os with pathlib where paths are used (#1984)

images/base-notebook/jupyter_server_config.py

@@ -4,6 +4,7 @@
 import os
 import stat
 import subprocess
+from pathlib import Path
 
 from jupyter_core.paths import jupyter_data_dir
 
@@ -24,15 +25,14 @@ distinguished_name = req_distinguished_name
 [req_distinguished_name]
 """
 if "GEN_CERT" in os.environ:
-    dir_name = jupyter_data_dir()
-    pem_file = os.path.join(dir_name, "notebook.pem")
-    os.makedirs(dir_name, exist_ok=True)
+    dir_name = Path(jupyter_data_dir())
+    dir_name.mkdir(parents=True, exist_ok=True)
+    pem_file = dir_name / "notebook.pem"
 
     # Generate an openssl.cnf file to set the distinguished name
-    cnf_file = os.path.join(os.getenv("CONDA_DIR", "/usr/lib"), "ssl", "openssl.cnf")
-    if not os.path.isfile(cnf_file):
-        with open(cnf_file, "w") as fh:
-            fh.write(OPENSSL_CONFIG)
+    cnf_file = Path(os.getenv("CONDA_DIR", "/usr/lib")) / "ssl/openssl.cnf"
+    if not cnf_file.exists():
+        cnf_file.write_text(OPENSSL_CONFIG)
 
     # Generate a certificate if one doesn't exist on disk
     subprocess.check_call(
@@ -50,8 +50,8 @@ if "GEN_CERT" in os.environ:
         ]
     )
     # Restrict access to the file
-    os.chmod(pem_file, stat.S_IRUSR | stat.S_IWUSR)
-    c.ServerApp.certfile = pem_file
+    pem_file.chmod(stat.S_IRUSR | stat.S_IWUSR)
+    c.ServerApp.certfile = str(pem_file)
 
 # Change default umask for all subprocesses of the Server if set in the environment
 if "NB_UMASK" in os.environ:

tests/scipy-notebook/data/matplotlib/matplotlib_1.py

@@ -1,8 +1,6 @@
 # Matplotlib: Create a simple plot example.
 # Refs: https://matplotlib.org/stable/gallery/lines_bars_and_markers/simple_plot.html
 
-import os
-
 # Optional test with [Matplotlib Jupyter Integration](https://github.com/matplotlib/ipympl)
 # %matplotlib widget
 import matplotlib.pyplot as plt
@@ -21,7 +19,8 @@ ax.set(
     title="About as simple as it gets, folks",
 )
 ax.grid()
+
 # Note that the test can be run headless by checking if an image is produced
-file_path = os.path.join("/tmp", "test.png")
+file_path = "/tmp/test.png"
 fig.savefig(file_path)
 print(f"File {file_path} saved")

tests/scipy-notebook/data/matplotlib/matplotlib_fonts_1.py

@@ -1,6 +1,4 @@
 # Matplotlib: Test tex fonts
-import os
-
 import matplotlib
 import matplotlib.pyplot as plt
 
@@ -22,6 +20,6 @@ y = [1, 2]
 ax.plot(x, y, label="a label")
 ax.legend(fontsize=15)
 
-file_path = os.path.join("/tmp", "test_fonts.png")
+file_path = "/tmp/test_fonts.png"
 fig.savefig(file_path)
 print(f"File {file_path} saved")