prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Reminder: remove dead module mods
  As discussed in #3083, the `mods.py` module should be removed **after the 4.0 release**.
  
  
  </issue>
  <code>
  [start of yt/mods.py]
  1 #
  2 # ALL IMPORTS GO HERE
  3 #
  4 
  5 import os
  6 
  7 import numpy as np
  8 
  9 # This next item will handle most of the actual startup procedures, but it will
  10 # also attempt to parse the command line and set up the global state of various
  11 # operations.  The variable unparsed_args is not used internally but is
  12 # provided as a convenience for users who wish to parse arguments in scripts.
  13 # https://mail.python.org/archives/list/yt-dev@python.org/thread/L6AQPJ3OIMJC5SNKVM7CJG32YVQZRJWA/
  14 import yt.startup_tasks as __startup_tasks
  15 from yt import *
  16 from yt.config import ytcfg, ytcfg_defaults
  17 from yt.utilities.logger import _level
  18 
  19 unparsed_args = __startup_tasks.unparsed_args
  20 
  21 
  22 if _level >= int(ytcfg_defaults["yt"]["log_level"]):
  23     # This won't get displayed.
  24     mylog.debug("Turning off NumPy error reporting")
  25     np.seterr(all="ignore")
  26 
  27 # We load plugins.  Keep in mind, this can be fairly dangerous -
  28 # the primary purpose is to allow people to have a set of functions
  29 # that get used every time that they don't have to *define* every time.
  30 # This way, other command-line tools can be used very simply.
  31 # Unfortunately, for now, I think the easiest and simplest way of doing
  32 # this is also the most dangerous way.
  33 if ytcfg.get("yt", "load_field_plugins"):
  34     enable_plugins()
  35
  [end of yt/mods.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/yt/mods.py b/yt/mods.py
  --- a/yt/mods.py
  +++ b/yt/mods.py
  @@ -13,9 +13,14 @@
   # https://mail.python.org/archives/list/yt-dev@python.org/thread/L6AQPJ3OIMJC5SNKVM7CJG32YVQZRJWA/
   import yt.startup_tasks as __startup_tasks
   from yt import *
  +from yt._maintenance.deprecation import issue_deprecation_warning
   from yt.config import ytcfg, ytcfg_defaults
   from yt.utilities.logger import _level
   
  +issue_deprecation_warning(
  +    "The yt.mods module is deprecated.", since="4.1.0", removal="4.2.0"
  +)
  +
   unparsed_args = __startup_tasks.unparsed_args
  
verification_info: {"golden_diff": "diff --git a/yt/mods.py b/yt/mods.py\n--- a/yt/mods.py\n+++ b/yt/mods.py\n@@ -13,9 +13,14 @@\n # https://mail.python.org/archives/list/yt-dev@python.org/thread/L6AQPJ3OIMJC5SNKVM7CJG32YVQZRJWA/\n import yt.startup_tasks as __startup_tasks\n from yt import *\n+from yt._maintenance.deprecation import issue_deprecation_warning\n from yt.config import ytcfg, ytcfg_defaults\n from yt.utilities.logger import _level\n \n+issue_deprecation_warning(\n+    \"The yt.mods module is deprecated.\", since=\"4.1.0\", removal=\"4.2.0\"\n+)\n+\n unparsed_args = __startup_tasks.unparsed_args\n", "issue": "Reminder: remove dead module mods\nAs discussed in #3083, the `mods.py` module should be removed **after the 4.0 release**.\r\n\n", "before_files": [{"content": "#\n# ALL IMPORTS GO HERE\n#\n\nimport os\n\nimport numpy as np\n\n# This next item will handle most of the actual startup procedures, but it will\n# also attempt to parse the command line and set up the global state of various\n# operations.  The variable unparsed_args is not used internally but is\n# provided as a convenience for users who wish to parse arguments in scripts.\n# https://mail.python.org/archives/list/yt-dev@python.org/thread/L6AQPJ3OIMJC5SNKVM7CJG32YVQZRJWA/\nimport yt.startup_tasks as __startup_tasks\nfrom yt import *\nfrom yt.config import ytcfg, ytcfg_defaults\nfrom yt.utilities.logger import _level\n\nunparsed_args = __startup_tasks.unparsed_args\n\n\nif _level >= int(ytcfg_defaults[\"yt\"][\"log_level\"]):\n    # This won't get displayed.\n    mylog.debug(\"Turning off NumPy error reporting\")\n    np.seterr(all=\"ignore\")\n\n# We load plugins.  Keep in mind, this can be fairly dangerous -\n# the primary purpose is to allow people to have a set of functions\n# that get used every time that they don't have to *define* every time.\n# This way, other command-line tools can be used very simply.\n# Unfortunately, for now, I think the easiest and simplest way of doing\n# this is also the most dangerous way.\nif ytcfg.get(\"yt\", \"load_field_plugins\"):\n    enable_plugins()\n", "path": "yt/mods.py"}]}