single linked list with insert, pop and print operations

linked_list.py

class node:
	def __init__(self, val):
		self.value = val
		self.next = None

class linked_list:
	def __init__(self):
		self.head = None

	def insert(self, value):
		if not(self.head):
			self.head = node(value)
		else:
			temp = self.head
			while(temp.next): 
				temp = temp.next
			temp.next = node(value)

	def print_list(self):
		if not(self.head):
			print "List Empty!"
			return
		temp = self.head
		while(temp.next):
			print temp.value,
			temp = temp.next
		print(temp.value)

	def pop(self):
		if not(self.head):
			raise Exception("Cannot pop! Empty list")
			return
		prev_tmp = None; tmp = self.head
		while(tmp.next):
			prev_tmp = tmp
			tmp = tmp.next
		if not(prev_tmp):
			self.head = None
			return tmp.value
		prev_tmp.next = None
		return tmp.value

#Errors : Not using self as parameter in methods
#Errors : Giving data types to identifiers
#Errors : mentioning instance variable outside init, making them class var.
#Errors : while loop without incrementing
l = linked_list()
l.insert(2)
l.insert(3)
l.print_list()
l.insert(4)
l.print_list()
print l.pop()
print l.pop()
l.print_list()
print l.pop()
l.print_list()
print l.pop()