pylint: Fix pylint error

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

src/fuzz_introspector/cfg_load.py

@@ -56,9 +56,8 @@ def __init__(
 def extract_all_callsites_recursive(
         calltree: CalltreeCallsite,
         callsite_nodes: List[CalltreeCallsite]) -> None:
-    """
-    Given a node, will assemble all callsites in the children. Recursive function.
-    """
+    """Given a node, will assemble all callsites in the children.
+    Recursive function."""
     callsite_nodes.append(calltree)
     for c in calltree.children:
         extract_all_callsites_recursive(c, callsite_nodes)
@@ -129,34 +128,34 @@ def data_file_read_calltree(filename: str) -> Optional[CalltreeCallsite]:
                 ctcs = CalltreeCallsite(target_func, filename, depth,
                                         linenumber, curr_ctcs_node)
 
-                # Check if this node is still a child of the current parent node and handle if not.
+                # Check if this node is still a child of the current parent node
+                # and handle if not.
                 if curr_depth == -1:
                     # First node
                     curr_ctcs_node = ctcs
                 elif depth > curr_depth and curr_ctcs_node is not None:
                     # We are going one calldepth deeper
-                    # Special case in the root parent case, where we have no parent in the current
-                    # node
-                    # and also no children.
-                    if (curr_ctcs_node.parent_calltree_callsite is None
-                            and len(curr_ctcs_node.children) == 0):
-                        None
-                    else:
+                    # Special case in the root parent case, where we have no
+                    # parent in the current node and also no children.
+                    if (curr_ctcs_node.parent_calltree_callsite
+                            or len(curr_ctcs_node.children) == 0):
                         curr_ctcs_node = curr_ctcs_node.children[-1]
 
                 elif depth < curr_depth and curr_ctcs_node is not None:
                     # We are going up, find out how much
                     depth_diff = int(curr_depth - depth)
                     tmp_node = curr_ctcs_node
                     idx = 0
-                    while idx < depth_diff and tmp_node.parent_calltree_callsite is not None:
+                    while (idx < depth_diff
+                           and tmp_node.parent_calltree_callsite is not None):
                         tmp_node = tmp_node.parent_calltree_callsite
                         idx += 1
                     curr_ctcs_node = tmp_node
                 # Add the node to the current parent
                 if curr_depth != -1 and curr_ctcs_node is not None:
                     ctcs.parent_calltree_callsite = curr_ctcs_node
-                    ctcs.src_function_name = ctcs.parent_calltree_callsite.dst_function_name
+                    ctcs.src_function_name = (
+                        ctcs.parent_calltree_callsite.dst_function_name)
                     curr_ctcs_node.children.append(ctcs)
                 curr_depth = depth
 

src/fuzz_introspector/diff_report.py

@@ -59,23 +59,25 @@ def _compare_numericals(num1, num2, title="", to_print=True) -> int:
       0 if num1 == num2
       1 if num1 > num2
     """
+    msg = ''
+    ret_val = -1
     if num1 < num2:
-        msg = "Report 2 has a larger %s than report 1" % (title)
+        msg = f"Report 2 has a larger {title} than report 1"
         ret_val = -1
     if num1 == num2:
-        msg = "Report 2 has similar %s to report 1" % (title)
+        msg = f"Report 2 has similar {title} to report 1"
         ret_val = 0
     if num1 > num2:
-        msg = "Report 2 has less %s than report 1" % (title)
+        msg = f"Report 2 has less {title} than report 1"
         ret_val = 1
     if to_print:
-        print("%s - {report 1: %s / report 2: %s})" %
-              (msg, str(num1), str(num2)))
+        print(f"{msg} - {{report 1: {num1} / report 2: {num2}}}")
 
     return ret_val
 
 
 def _compare_summary_of_all_functions(first_report, second_report):
+    """Internal helper to compare summary of all functions."""
     all_funcs1 = first_report['MergedProjectProfile']['all-functions']
     all_funcs2 = second_report['MergedProjectProfile']['all-functions']
 
@@ -138,19 +140,17 @@ def _compare_summary_of_all_functions(first_report, second_report):
             for func_name in report1_reached_only:
                 print(func_name)
         else:
-            print(
-                "- All functions reachable in report 1 are reachable in report 2"
-            )
+            print("- All functions reachable in report 1 are reachable"
+                  " in report 2")
 
         print("")
         print("The following functions are only reachable in report 2:")
         if len(report2_reached_only) > 0:
             for func_name in report2_reached_only:
                 print(func_name)
         else:
-            print(
-                "- All functions reachable in report 2 are reachable in report 1"
-            )
+            print("- All functions reachable in report 2 are reachable"
+                  " in report 1")
 
 
 def _compare_report_dictionaries(first_report, second_report):