[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

backtracking/Remove_Invalid_Parenthesis.py

@@ -1,20 +1,22 @@
 def isParenthesis(c):
-	return ((c == '(') or (c == ')')) 
+    return (c == "(") or (c == ")")
+
 
 def isValidString(str):
     cnt = 0
     for i in range(len(str)):
-		if (str[i] == '('):
+        if str[i] == "(":
             cnt += 1
-		elif (str[i] == ')'):
+        elif str[i] == ")":
             cnt -= 1
-		if (cnt < 0):
+        if cnt < 0:
             return False
-	return (cnt == 0)
+    return cnt == 0
+
 
 # method to remove invalid parenthesis
 def removeInvalidParenthesis(str):
-	if (len(str) == 0):
+    if len(str) == 0:
         return
 
     visit = set()
@@ -25,26 +27,26 @@ def removeInvalidParenthesis(str):
 
     q.append(str)
     visit.add(str)
-	while(len(q)):
+    while len(q):
         str = q[0]
         q.pop(0)
-		if (isValidString(str)):
+        if isValidString(str):
             print(str)
 
             level = True
-		if (level):
+        if level:
             continue
         for i in range(len(str)):
-			if (not isParenthesis(str[i])):
+            if not isParenthesis(str[i]):
                 continue
 
-			temp = str[0:i] + str[i + 1:] 
+            temp = str[0:i] + str[i + 1 :]
             if temp not in visit:
                 q.append(temp)
                 visit.add(temp)
 
+
 expression = "()())()"
 removeInvalidParenthesis(expression)
 expression = "()v)"
 removeInvalidParenthesis(expression)
-