Removed colorama / coloredlogs, they are now optional packages dynamically loaded

requirements.txt

@@ -3,8 +3,6 @@ attrs>=18.0
 backports.functools-lru-cache>=1.0.2 ; python_version < '3'
 boto3>=1.9
 botocore>=1.12
-colorama>=0.4.1
-coloredlogs>=10.0
 enum34>=0.9 ; python_version < '3.6'
 funcsigs>=1.0
 furl>=2.0.0

trains/debugging/log.py

@@ -6,9 +6,7 @@ import os
 import sys
 from platform import system
 
-import colorama
 from ..config import config, get_log_redirect_level
-from coloredlogs import ColoredFormatter
 from pathlib2 import Path
 from six import BytesIO
 from tqdm import tqdm
@@ -34,11 +32,22 @@ class LoggerRoot(object):
     def _make_stream_handler(cls, level=None, stream=sys.stdout, colored=False):
         ch = logging.StreamHandler(stream=stream)
         ch.setLevel(level)
+        formatter = None
+
+        # if colored, try to import colorama & coloredlogs (by default, not in the requirements)
         if colored:
-            colorama.init()
-            formatter = ColoredFormatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
-        else:
+            try:
+                import colorama
+                from coloredlogs import ColoredFormatter
+                colorama.init()
+                formatter = ColoredFormatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+            except ImportError:
+                colored = False
+
+        # if we don't need or failed getting colored formatter
+        if not colored or not formatter:
             formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+
         ch.setFormatter(formatter)
         return ch