make explicity that fac can accept strings

Author: scarlehoff

.gitignore

@@ -161,3 +161,4 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+path_to_pinecards

examples/.gitignore

@@ -7,7 +7,7 @@
 
 [paths]
 # paths relative to the location of this file
-runcards = "examples"
+runcards = "path_to_pinecards"
 results = "results"
 # theories = "theories"
 # prefix = ".prefix"

pinefarm.toml

@@ -9,6 +9,7 @@
 from dataclasses import dataclass, field
 from functools import cached_property
 from pathlib import Path
+from typing import Union
 
 import numpy as np
 from yaml import safe_load
@@ -55,7 +56,7 @@ class Histogram:
     bins: list
     extra_selectors: dict = None
     pineappl: bool = True
-    fac: int = None
+    fac: Union[float, str] = None
     compositions: list[dict] = field(default_factory=list)
 
     def __post_init__(self):
@@ -222,7 +223,7 @@ def parse_input_yaml(yaml_path):
 
 
 def _fill_process(process):
-    """Fill process block given the metadata for the process"""
+    """Fill process block given the metadata for the process."""
     process_name = process["proc"]
     sqrts = process["sqrts"]
     jet = process.get("jet", "none[0]")  # Can be None