Drop the dependency on ansicolors

The package is not actively maintained (last released in 2017), and the
function we use is just based on a single simple regular expression.
Copy the regular expression into papermill and drop the external
dependency.

Author: musicinmybrain

binder/requirements.txt

@@ -3,4 +3,3 @@ pandas
 matplotlib
 ipywidgets
 ipykernel
-ansicolors

papermill/exceptions.py

@@ -1,4 +1,4 @@
-from colors import strip_color
+import re
 
 
 class AwsError(Exception):
@@ -59,6 +59,23 @@ class PapermillParameterOverwriteWarning(PapermillWarning):
     """Callee overwrites caller argument to pass down the stream."""
 
 
+def strip_color(text):
+    """Remove most ANSI color and style sequences from a string
+
+    Based on https://pypi.org/project/ansicolors/."""
+
+    # The regular expression is copied from:
+    # https://github.com/jonathaneunice/colors/blob/
+    #    c965f5b9103c5bd32a1572adb8024ebe83278fb0/colors/colors.py#L122-L131
+    #
+    # The original docstring notes that this does not strip all possible ANSI
+    # escape sequences related to color and style, but it attempts to cover the
+    # most common ones and a few known oddities produced by actual
+    # colorization libraries, including \x1b[K (EL, erase to end of line) and
+    # \x1b[m (more commonly expressed as \x1b[0m).
+    return re.sub("\x1b\\[(K|.*?m)", "", text)
+
+
 def missing_dependency_generator(package, dep):
     def missing_dep():
         raise PapermillOptionalDependencyException(

papermill/tests/test_execute.py

@@ -8,11 +8,10 @@
 from unittest.mock import ANY, patch
 
 import nbformat
-from colors import strip_color
 from nbformat import validate
 
 from .. import engines, translators
-from ..exceptions import PapermillExecutionError
+from ..exceptions import PapermillExecutionError, strip_color
 from ..execute import execute_notebook
 from ..iorw import load_notebook_node
 from ..log import logger

requirements.txt

@@ -7,4 +7,3 @@ requests
 entrypoints
 tenacity >= 5.0.2
 aiohttp >=3.9.0; python_version=="3.12"
-ansicolors