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Asking the user for input until they give a valid response
(22 answers)
Closed 7 months ago.
I’m having an issue with part of my code.
I’ve created a dictionary below
names_meaning = {
"Taiwo": "First of a twin",
"Tariro": "Hope" ,
"Joseph": "God will add",
"Joel": "YHWH (or LORD) is God",
"Jude": "Praised",
"Hannah": "Favour or Grace"
}
I created a new list from the keys in the dictionary above.
family_names = list(names_meaning.keys())
Then I’m asking the user for an input and I’ve called it below.
name = input("Please type a name to know the meaning: ").capitalize()
From the user’s input, I am checking to see if it is in a family_names.
if name not in family_names:
print(f"You can only pick a name from this list of names {family_names}.")
name = input("Please type a name to know the meaning: ").capitalize()
else:
print(f"{name} means: {names_meaning[name]}\n")
The check works only once. I need the check to continue saying "Please type a name to know the meaning: " until the user types in the correct name.
What am I doing wrong?
use a while loop to continue asking for input until it is valid, then break out of the loop.
names_meaning = {
"Taiwo": "First of a twin",
"Tariro": "Hope",
"Joseph": "God will add",
"Joel": "YHWH (or LORD) is God",
"Jude": "Praised",
"Hannah": "Favour or Grace",
}
family_names = list(names_meaning.keys())
name = input("Please type a name to know the meaning: ").capitalize()
run = True
while run:
if name not in family_names:
print(f"You can only pick a name from this list of names
{family_names}.")
name = input("Please type a name to know the meaning: ").capitalize()
if name in family_names:
print(f"{name} means: {names_meaning[name]}\n")
break
else:
print(f"{name} means: {names_meaning[name]}\n")
break
Related
in case it isn't already obvious im new to python so if the answers could explain like im 5 years old that would be hugely appreirecated.
I'm basically trying to prove to myself that I can apply some of the basic that I have learnt into making a mini-contact book app. I don't want the data to save after the application has closed or anything like that. Just input your name, phone number and the city you live in. Once multiple names are inputted you can input a specific name to have their information printed back to you.
This is what I have so far:
Name = input("enter name here: ")
Number = input("enter phone number here: ")
City = input("enter city here: ")
User = list((Name, Number, City))
This, worked fine for the job of giving python the data. I made another input that made python print the information back to me just to make sure python was doing what I wanted it to:
print("Thank you! \nWould you like me to read your details back to you?")
bck = input("Y / N")
if bck == "Y":
print(User)
print("Thank you! Goodbye")
else:
print("Goodbye!")
The output of this, is the list that the user creates through the three inputs. Which is great! I'm happy that I have managed to make it function so far;
But I want the 'Name' input to be what names the 'User' list. This way, if I ask the user to input a name, that name will be used to find the list and print it.
How do I assign the input from Name to ALSO be what the currently named "User" list
You will need to create a variable which can store multiple contacts inside of it. Each contact will be a list (or a tuple. Here I have used a tuple, but it doesn't matter much either way).
For this you could use a list of lists, but a dictionary will be more suitable in this case.
What is a dictionary?
A dictionary is just like a list, except that you can give each of the elements a name. This name is called a "key", and it will most commonly be a string. This is perfect for this use case, as we want to be able to store the name of each contact.
Each value within the dictionary can be whatever you want - in this case, it will be storing a list/tuple containing information about a user.
To create a dictionary, you use curly brackets:
empty_dictionary = {}
dictionary_with_stuff_in_it = {
"key1": "value1",
"key2": "value2"
}
To get an item from a dictionary, you index it with square brackets, putting a key inside the square brackets:
print(dictionary_with_stuff_in_it["key1"]) # Prints "value1"
You can also set an item / add a new item to a dictionary like so:
empty_dictionary["a"] = 1
print(empty_dictionary["a"]) # Prints 1
How to use a dictionary here
At the start of the code, you should create an empty dictionary, then as input is received, you should add to the dictionary.
Here is the code I made, in which I have used a while loop to continue receiving input until the user wants to exit:
contacts = {}
msg = "Would you like to: \n - n: Enter a new contact \n - g: Get details for an existing contact \n - e: Exit \nPlease type n, g, or e: \n"
action = input(msg)
while action != "e":
if action == "n": # Enter a new contact
name = input("Enter name here: ")
number = input("Enter phone number here: ")
city = input("Enter city here: ")
contacts[name] = (number, city)
print("Contact saved! \n")
action = input(msg)
elif action == "g": # Get details for an existing contact
name = input("Enter name here: ")
try:
number, city = contacts[name] # Get that contact's information from the dictionary, and store it into the number and city variables
print("Number:", number)
print("City:", city)
print()
except KeyError: # If the contact does not exist, a KeyError will be raised
print("Could not find a contact with that name. \n")
action = input(msg)
else:
action = input("Oops, you did not enter a valid action. Please type n, g, or e: ")
#can be easier to use with a dictionary
#but its just basic
#main list storing all the contacts
Contact=[]
#takes length of contact list,'int' just change input from string to integer
contact_lenght=int(input('enter lenght for contact'))
print("enter contacts:-")
#using for loop to add contacts
for i in range(0,len(contact_lenght)):
#contact no.
print("contact",i+1)
Name=input('enter name:')
Number=input('enter number:')
City=input("enter city:")
#adding contact to contact list using .append(obj)
Contact.append((Name,Number,City))
#we can directly take input from user using input()
bck=input("Thank you! \nWould you like me to read your details back to you?[y/n]:")
#checking if user wants to read back
if bck=='y':
u=input("enter your name:")
#using for loop to read contacts
for i in range(0,len(Contact)):
#if user name is same as contact name then print contact details
if u==Contact[i][0]:
print("your number is",Contact[i][1])
print("your city is",Contact[i][2])
else:
#if user doesnt want to read back then print thank you
print("Good bye")
For this purpose you should use a dictionary.
The key of every entry should be the string 'User[0]' that corresponds to the person's name.
The contents of every entry should be the list with the information of that user.
I'll give you an example:
# first we need to create an empty dictionary
data = {}
# in your code when you want to store information into
# the dictionary you should do like this
user_name = User[0] # this is a string
data[user_name] = User # the list with the information
If you want to access the information of one person you should do like this:
# user_you_want string with user name you want the information
data[user_you_want]
Also you can remove information with this command:
del data[user_you_want_to_delete]
You can get more information on dictionaries here: https://docs.python.org/3/tutorial/datastructures.html#dictionaries
You should start by defining a class to support name, phone and city. Once you've done that, everything else is easy.
class Data:
def __init__(self, name, city, phone):
self.name = name
self.city = city
self.phone = phone
def __eq__(self, other):
if isinstance(other, str):
return self.name == other
if isinstance(name, type(self)):
return self.name == other.name and self.city == other.city and self.phone == other.phone
return False
def __str__(self):
return f'Name={self.name}, City={self.city}, Phone={self.phone}'
DataList = []
while (name := input('Name (return to finish): ')):
city = input('City: ')
phone = input('Phone: ')
DataList.append(Data(name, city, phone))
while (name := input('Enter name to search (return to finish): ')):
try:
print(DataList[DataList.index(name)])
except ValueError:
print('Not found')
When I input "Ali" it jumps to new user statement. Anyone please explain me why?
Data_base = [["Ali","1234","5000"],["Sara","1234","2000"]]
User_name = input("Enter your name")
if User_name in Data_base:
print("User persent")
elif User_name not in Data_base:
print("New User")
New_User_name = input("Your name: ")
Data_base.append(New_User_name)
print(Data_base)
The problem is that your list is made up of two separate lists.
Data_base = [["Ali","1234","5000"],["Sara","1234","2000"]]
So when you check if the input is in the list, Python checks if any of the internal values are equal to the input. i.e.:
input = ["Ali","1234","5000"] or input = ["Sara","1234","2000"]
By grouping it into a list I assume the second and third values belong to the first value. Instead of the list I would suggest using a dictionary:
Data_base = {"Ali" : ["1234","5000"], "Sara" : ["1234","2000"]}
And then, for checking:
if User_name in Data_base:
print("User persent")
else:
# Do whatever
I am trying to make a script that asks for user input in Python, it is supposed to error with the response "Please enter first name", and then return the user back to the initial input question prompt.
This isn't working, instead after asking for both the first and last name if no name is given for both I am thrown into an infinite loop of the first error.
# User input for first name
first_name = input('Enter FIRST name here: ')
# User input for last name
last_name = input('Enter LAST name here: ')
def print_name():
# store user input in separate variable
fname = first_name
lname= last_name
while True:
# throw error if user enters no first name
if len(fname) == 0:
# error msg
print('No FIRST name entered...')
# loop back to prompt asking for first name
continue
else:
# if first name given move on to prompting for last name
# break loop
break
# loop into prompting user for last name
while True:
# throw error if user enters no last name
if len(lname) == 0:
print('No LAST name entered...')
# loop back to prompt asking for last name
continue
else:
# if last name given move on to running print command
# break loop
break
return fname, lname
print(f'your name is {fname} {lname}')
print_name()
Please can someone help me understand whats going wrong here? It should only loop back to asking for a first name (or last name) when nothing is given, other wise it should print the users name to console. both names should be given too, if first name is not given then id expect an error in the first while loop, like wise if last name is not given.
Also is there a better way to do this? using 2 while loops seems wrong?
Don't repeat yourself. If you copy and paste a section of code, stop and think. It should either be a function, or a loop.
def wait_for_input(prompt):
data = ""
while data == "":
data = input(prompt).strip()
return data
def print_name(fname, lname):
print(f'your name is {fname} {lname}')
first_name = wait_for_input('Enter FIRST name: ')
last_name = wait_for_input('Enter LAST name: ')
print_name(first_name, last_name)
Also, don't use comments to repeat what the code says.
The issue is with your infinite loops, you can simplify your function like:
def print_name():
first_name = ""
last_name = ""
# User input for first name
while first_name == "":
first_name = input('Enter FIRST name here: ')
# User input for last name
while last_name == "":
last_name = input('Enter LAST name here: ')
print(f'your name is {first_name} {last_name}')
I have the impression you are new at this:
While-loops generally look as follows:
while <condition>
...
<check_condition>
...
This means that in most cases, at every time the loop is executed, the condition is re-calculated and checked again by the while.
In your case, this would become something like:
while (len(fname) == 0)
<show_error_message>
<get fname again>
The case you have written here (while true) also exists and is used regularly, but in very different cases, like in multi-threaded event-based programs:
while true
<get_event>
This means that a part of the program (a so-called thread) is waiting for an event (like a buttonclick) to be catched and then something happens. This, however, is mostly done in multi-threaded applications, which means that the "main" program is doing something, while a subprogram is handling the events, which are coming in.
I am not fully understanding why you need so many loops. Something like this should do:
def print_name():
fname = input('Enter FIRST name here: ')
if len(fname) == 0:
raise Exception('No FIRST name entered...')
lname= input('Enter LAST name here: ')
if len(lname) == 0:
raise Exception('No LAST name entered...')
print(f"your name is {fname} {lname}")
And if all you wanted is to repeat this loop all you need to do is nest your print_name() function in a loop.
EDIT: Now that I seen other answers, I believe #Tomalak answer is better, was not getting what you really wanted.
Try this code:
def print_name():
# store user input in separate variable
first_name = input('Enter FIRST name here: ')
fname = first_name
while True:
fname = first_name
# throw error if user enters no first name
if len(fname) == 0:
# error msg
print('No FIRST name entered...')
first_name = input('Enter FIRST name here: ')
# loop back to prompt asking for first name
continue
else:
# if first name given move on to prompting for last name
# break loop
break
# loop into prompting user for last name
while True:
last_name = input('Enter LAST name here: ')
lname= last_name
# throw error if user enters no last name
if len(lname) == 0:
print('No LAST name entered...')
# loop back to prompt asking for last name
continue
else:
# if last name given move on to running print command
# break loop
break
return fname, lname
print(f'your name is {fname} {lname}')
print_name()
I am attempting to create a program that asks for the user to enter his/her name and records the input into a list (Was working towards dictionary but seems like I made a boo boo!) but it is returning with "TypeError: can only concatenate list (not "str") to list". The following is the code.Thanks in advance.
namedic = []
while True:
print ("Please, enter your name:")
name = input()
if len(name) > 3:
print ("Welcome")
else:
print ("Ew, your name have less than 4 letters! Gross! Try a new one")
continue
namedic = namedic + name
print ("Ah, your name have at least 4 words, good name.")
for name in namedic:
print (name)
Your erroring line is namedic = namedic + name. What you're trying to do is add a list (namedic) to a string (name). You should do namedic.append(name) instead.
The + operator isn't used to append elements to a list, as the error shows. You can use the append method for that:
namedic.append(name)
#your code should rather be like this;
namedic = []
while True:
print ("Please, enter your name:")
name = input()
if len(name) > 3:
print ("Welcome")
else:
print ("Ew, your name have less than 4 letters! Gross! Try a new one")
continue
namedic.append(name)
print ("Ah, your name have at least 4 words, good name.")
for name in namedic:
print (name)
names=["aaa","bbb","ccc","ddd","eee"]
itMarks=[90,98,87,98,78]
def printMainMenu():
print(" Main Menu")
print(" =========")
print(" (1)Add Student")
print(" (2)Search Student")
print(" (3)Delete Student")
print(" (4)List Student")
print(" (5)Exit")
choice = int(input("Enter Your choice[1-5]:"))
return choice
def searchStudent(names,itMarks):
name = input("Enter Name")
i = names.index(names)
print("Index is" + i)
def deleteStudent(student,itMarks):
name = input("Enter Name to remove")
student.remove(names)
print("Successfully Deleted" + names)
def removeStudent(names):
name = input("Enter name to remove")
name.remove(name)
print("Successfully deleted" + names)
def addStudent(names, itMarkas):
name = input("Enter Name")
names.append(names)
itMarks = input("Enter IT Marks")
itMarks.append(itMarks)
def listStudent(names, itMarks):
for i in range(0, len(names)):
print(names[1], "", itMarks[i])
names = []
itMarks = []
choice = 1
while choice >= 1 and choice <= 4:
choice = printMainMenu()
if choice == 1:
addStudent(names, itMarks)
elif choice == 2:
searchStudent(names, itMarks)
elif choice == 3:
deleteStudent(names, itMarks)
elif choice == 4:
listStudent(names, itMarks)
elif choice == 5:
print("Exit from the program")
else:
print("invalid choice!")
choice = 1
I am new to the programming in Python. The following Python code is written to do some tasks with the array. There are two array named names and itMarks. And there are some functions :
addStudent() - To add students to the array
searchStudent() - To search a student with in the list.
deleteStudent() - To delete the given student from the list.
listStudent() - To list out the all the names of the students in the list.
When the program runs, it asks to select a choice. Then it do the task according to their choice. But when I run this coding it shows the errors.
Please help me. Thanks in advance.
ERROR :
When I select the choice 1 (Add student) and input name after the error is yield.
Traceback (most recent call last):
File "C:\Users\BAALANPC\Desktop\new 3.py", line 59, in <module>
addStudent(names, itMarks)
File "C:\Users\BAALANPC\Desktop\new 3.py", line 42, in addStudent
name = input("Enter Name")
File "<string>", line 1, in <module>
NameError: name 'rtrt' is not defined
Their so many mistakes in naming
In addStudent
def addStudent(names, itMarkas):
name = input("Enter Name")
names.append(name) # names cant appent it should be name
itMark = input("Enter IT Marks") # here itmark not itMarks
itMarks.append(itMark)
In searchStudent
def searchStudent(names,itMarks):
name = input("Enter Name")
i = names.index(name) # try to find index of name not names
print("Index is" + i)
In deleteStudent
def deleteStudent(student,itMarks):
name = input("Enter Name to remove")
student.remove(name) # try to remove name not names
print("Successfully Deleted" + name)
after change above I run its running you have to also change the naming of the variable for all methods
Output
Main Menu
=========
(1)Add Student
(2)Search Student
(3)Delete Student
(4)List Student
(5)Exit
Enter Your choice[1-5]:1
add student
Enter Name"aaa"
Enter IT Marks111
Main Menu
=========
(1)Add Student
(2)Search Student
(3)Delete Student
(4)List Student
(5)Exit
Enter Your choice[1-5]:
I'm assuming this is the correct form:
def searchStudent(names,itMarks):
name = input("Enter Name")
i = names.index(name)
print("Index is" + i)
note that I changed names to name.
also the same mistake again
def deleteStudent(student,itMarks):
name = input("Enter Name to remove")
student.remove(name)
print("Successfully Deleted" + names)
tl;dr revise your code
searchStudent(): You shouldn't need the itMarks argument if you're not using it inside your function at all. names refers to the list of names, but you are really trying to search name. i is an integer that is attempting to be concatenated with a string. Not allowed. It should be str(i).
deleteStudent(): Better to keep your arguments consistent and use names rather than student. Again, same problem as above, should be .remove(name) and you shouldn't need the itMarks argument. print statement should refer to name not names.
removeStudent(): This is the same code as deleteStudent(), but not used, so not sure why it's there.
addStudent(): Typo in the argument, .append(name). You have a global variable and a local variable named the same thing, which are conflicting to the program. Change the input set to itMark and .append(itMark).
listStudent(): print statement has a typo, 1 should be i. Not sure why the empty string is included as well.
Underneath your function def's, you restate your variables as empty lists. This can lead to ValueErrors from a lot of your functions as you're trying to look something up or modify something in an empty list. Simply delete this code.
Additionally, any error will break your while loop. I suggest adding more booleans or using a try except clause to catch these errors.
Good luck!