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

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

backtracking/Remove_Invalid_Parenthesis.py

@@ -1,50 +1,52 @@
 def isParenthesis(c):
-	return ((c == '(') or (c == ')')) 
+    return (c == "(") or (c == ")")
+
 
 def isValidString(str):
-	cnt = 0
+    cnt = 0
-	for i in range(len(str)):
+    for i in range(len(str)):
-		if (str[i] == '('):
+        if str[i] == "(":
-			cnt += 1
+            cnt += 1
-		elif (str[i] == ')'):
+        elif str[i] == ")":
-			cnt -= 1
+            cnt -= 1
-		if (cnt < 0):
+        if cnt < 0:
-			return False
+            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
+        return
 
-	visit = set()
+    visit = set()
 
-	q = []
+    q = []
-	temp = 0
+    temp = 0
-	level = 0
+    level = 0
 
-	q.append(str)
+    q.append(str)
-	visit.add(str)
+    visit.add(str)
-	while(len(q)):
+    while len(q):
-		str = q[0]
+        str = q[0]
-		q.pop(0)
+        q.pop(0)
-		if (isValidString(str)):
+        if isValidString(str):
-			print(str)
+            print(str)
 
-			level = True
+            level = True
-		if (level):
+        if level:
-			continue
+            continue
-		for i in range(len(str)):
+        for i in range(len(str)):
-			if (not isParenthesis(str[i])):
+            if not isParenthesis(str[i]):
-				continue
+                continue
+
+            temp = str[0:i] + str[i + 1 :]
+            if temp not in visit:
+                q.append(temp)
+                visit.add(temp)
 
-			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)
-