Remove obsoleted code. Fix linting errors.

Remove the old code that relied on exceptions to parse errors in the
uploaded files.

1 files changed, 8 insertions, 25 deletions

diff --git a/quality_control/headers.py b/quality_control/headers.py
index 3b1e0e6..79d7e43 100644
--- a/quality_control/headers.py
+++ b/quality_control/headers.py
@@ -4,41 +4,22 @@ from functools import reduce
 from typing import Union, Tuple, Sequence
 
 from quality_control.errors import InvalidValue, DuplicateHeading
-from quality_control.errors import DuplicateHeader, InvalidHeaderValue
-
-def valid_header(strains, headers):
-    "Return the valid headers with reference to strains or throw an error"
-    if not bool(headers[1:]):
-        raise InvalidHeaderValue(
-        "The header MUST contain at least 2 columns")
-    invalid_headers = tuple(
-        header for header in headers[1:] if header not in strains)
-    if invalid_headers:
-        raise InvalidHeaderValue(
-            *(f"'{header}' not a valid strain." for header in invalid_headers))
-
-    unique_headers = set(headers)
-    if len(unique_headers) != len(headers):
-        repeated = (
-            (header, headers.count(header))
-            for header in unique_headers if headers.count(header) > 1)
-        raise DuplicateHeader(*(
-            f"'{header}' is present in the header row {times} times."
-            for header, times in repeated))
-
-    return headers
-
 
 def invalid_header(
         line_number: int, headers: Sequence[str]) -> Union[InvalidValue, None]:
+    """Return an `InvalidValue` object if the header row has less than 2
+    items."""
     if len(headers) < 2:
         return InvalidValue(
             line_number, 0, "<TAB>".join(headers),
             "The header MUST contain at least 2 columns")
+    return None
 
 def invalid_headings(
         line_number: int, strains: Sequence[str],
         headings: Sequence[str]) -> Union[Tuple[InvalidValue, ...], None]:
+    """Return tuple of `InvalidValue` objects for each error found for every
+    column heading."""
     return tuple(
         InvalidValue(
             line_number, col, header, f"'{header}' not a valid strain.")
@@ -47,13 +28,15 @@ def invalid_headings(
 
 def duplicate_headings(
         line_number: int, headers: Sequence[str]) -> Union[InvalidValue, None]:
+    """Return a tuple of `DuplicateHeading` objects for each column heading that
+    is a duplicate of another column heading."""
     def __update_columns__(acc, item):
         if item[1] in acc.keys():
             return {**acc, item[1]: acc[item[1]] + (item[0],)}
         return {**acc, item[1]: (item[0],)}
     repeated = {
         heading: columns for heading, columns in
-        reduce(__update_columns__, enumerate(headers, start=1), dict()).items()
+        reduce(__update_columns__, enumerate(headers, start=1), {}).items()
         if len(columns) > 1
     }
     return tuple(