for loop with if statement not showing list of lists result

Question

below is my code and there are two version. First, for loop without if statement and second, for loop with if statement. From what I have found that, if I remove if statement on first version, the result will show all employees information. I'm still learning python and thanks in advance

def addNew():
 global employees
 newEmp = []
 checkList = []
 newEmp.append(input("Enter id: "))
 newEmp.append(input("Enter name: "))
 newEmp.append(input("Enter department: "))
 newEmp.append(input("Enter position: "))
 checkList.append(newEmp)
 for new in checkList:
 print(new)
 for exist in employees:
 print(exist)
result
['1001', 'das', 'das', 'das'] # from print(new)
['1000', 'tim', 'hr', 'admin'] # from print(exist)
['1003', 'jim', 'hr', 'clerk'] # from print(exist)
['1007', 'ida', 'hr', 'audit'] # from print(exist)
['1005', 'mia', 'itss', 'security'] # from print(exist)

However, on this second version code below, if I put the if statement in for loop the result will only show one employee information.

def addNew():
 global employees
 newEmp = []
 checkList = []
 newEmp.append(input("Enter id: "))
 newEmp.append(input("Enter name: "))
 newEmp.append(input("Enter department: "))
 newEmp.append(input("Enter position: "))
 checkList.append(newEmp)
 for new in checkList:
 print(new)
 for exist in employees:
 print(exist)
 if new[0] == exist[0]:
 print("entered id",new[0],"is already exist")
 break
 elif new[0] != exist[0]:
 employees.extend(checkList)
 break
result
['1001', 'das', 'das', 'das'] # from print(new)
['1000', 'tim', 'hr', 'admin'] # from print(exist)

• Heike: The for loop ends because of the break statements. Remove them if you want to go through the whole list.
• Izzat Rashid: why why why. I have spend almost 2 hour how to solve this. thank you master @Heike

Answer 1

It's because it either went inside the if statement or the elif statement and since both of them have a break statement, the inner loop is terminated immediately even though not all the employees have been gone through yet.

• Izzat Rashid: shame on me. why can't I saw this break cause my program not function as I expected. thank you for your help. :)