I don't know how but it seems that my ages keep getting mixed up within the while loop. It also doesn't include one of the names. The loop works within the IDE but I can't get it to write correctly into the text file.
def main():
friendsfile = open('friends.txt', 'w')
name = str(input('Enter first name of friend or Enter to quit : '))
while name != '':
age = int(input('Enter age of this friend : '))
name = str(input('Enter first name of friend or Enter to quit : '))
friendsfile.write(name + '\n')
friendsfile.write(str(age) + '\n')
friendsfile.close()
print('File was created')
main()
When I enter the names Justin with age 13, Scott with age 20, and Lucy with age 14 I get this written to the file.
Scott
13
Lucy
20
14
The problem is that the name variable gets updated before you print it. This should work:
while name != '':
age = int(input('Enter age of this friend : '))
friendsfile.write(name + '\n')
friendsfile.write(str(age) + '\n')
name = str(input('Enter first name of friend or Enter to quit : '))
Related
I am new to Python and I have been stuck trying out a "simple banking program".
I have got everything right except for this bit:
If the user types S then:
Ask the user for the account number.
Search the array for that account number and find its position in the accountnumbers array.
Display the Name, and balance at the position found during the above search.
Originally it was just supposed to be through accounts 1-5, but now I am having trouble coming up with a way to search the account numbers if they are any number, not just 1 - 5. For example
The user makes his account numbers 34, 445, 340,2354 and 3245. Completely random account numbers with no order.
Here is what I have so far
names = []
accountNumbers = []
balance = []
def displaymenu():
print("**** MENU OPTIONS ****")
print("Type P to populate accounts")
print("Type S to search for account")
print("Type E to exit")
choiceInput()
def choiceInput():
choice = str(input("Please enter your choice: "))
if (choice == "P"):
populateAccount()
elif (choice == "S"):
accountNumb = int(input("Please enter the account number to search: "))
if (accountNumb > 0) and (accountNumb < 6):
print("Name is: " + str(names[accountNumb - 1]))
print(names[accountNumb - 1] + " account has the balance of : $" + str(balance[accountNumb -1]))
elif (accountNumb == accountNumbers):
index = names.index(accountNumb)
accountNumb = index
print(names[accountNumb - 1] + " account has the balance of : $" + str(balance[accountNumb -1]))
else:
print("The account number not found!")
elif (choice == "E"):
print("Thank you for using the program.")
print("Bye")
raise SystemExit
else:
print("Invalid choice. Please try again!")
displaymenu()
def populateAccount ():
name = 0
for name in range(5):
Names = str(input("Please enter a name: "))
names.append(Names)
account ()
name = name + 1
def account ():
accountNumber = int(input("Please enter an account number: "))
accountNumbers.append(accountNumbers)
balances()
def balances ():
balances = int(input("Please enter a balance: "))
balance.append(balances)
displaymenu()
I have tried to use indexes and have not been able to find a solution.
Replace the following line of code
if (accountNumb > 0) and (accountNumb < 6):
with
if (accountNumb > 0) and (accountNumb < len(accountNumbers)):
My mistake. I messed up when appending the account number:
def account ():
accountNumber = int(input("Please enter an account number: "))
accountNumbers.append(accountNumbers)
balances()
I appended
accountNumbers
not
accountNumber
the code should be
def account ():
accountNumber = int(input("Please enter an account number: "))
accountNumbers.append(accountNumber)
balances()
also the searchArray function I made was:
def searchArray(accountNumbers):
x = int(input("Please enter an account number to search: "))
y = accountNumbers.index(x)
print("Name is: " + str(names[y]))
print(str(names[y]) + " account has a balance of: " + str(balance[y]))
rookie mistake , shouldnt be using such similar object names.
Why he gives me (Type error) in that statment
" address = cur.fetchone()[2] last = cur.fetchone()[4] no = cur.fetchone()[5] , while it accept "name = cur.fetchone()[1]" in the code : "
import sqlite3
conn = sqlite3.connect('myproject.sqlite')
cur = conn.cursor()
print "Welcome Mr/Hefnawy"
cur.execute('SELECT phone FROM participants')
b = cur.fetchone()[0]
while True:
a = raw_input("Enter Phone number here : ")
if a == b :
cur.execute('SELECT name,address,last_order,no_of_orders FROM participants WHERE phone = ?',(b, ))
name = cur.fetchone()[1]
address = cur.fetchone()[2]
last = cur.fetchone()[4]
no = cur.fetchone()[5]
print "The Costumer is already exist in Paricipants "
print "To edit the costumer data press (1)", "\n" , "to delet the costumer press (2)", "\n" , "add new order to the costumer press (3) "
c = raw_input("Enter your choice here : ")
if c == "1":
print "What do you want to edit ? , to edit name press 1 , to edit address press 2 , to edit phone press 3"
d = raw_input("Enter your choice here : ")
if d == "1" :
e = raw_input("New costumer name please ")
cur.execute('UPDATE participants SET name = ? WHERE phone = ?' , (e , a))
print "Costumer name has been updated to :", e
print ""
conn.commit()
else:
print "The costumer is not exist"
print b
print a , type(a)
When you are fetching something from a cursor say for example
t = cur.fetchone()
you can access the data from t using
print t[0],t[1],t[2] but In your case you are using multiple cur.fetchone() which allows you to use name = cur.fetchone()[1] that ends the data in the cursor. The second line address = cur.fetchone()[2] and the lines that follow it do not have a sql query executed for them to fetch, hence giving you the error. If you want to access the whole row just assign it to a variable and use the variable to get the data.
I have a text file that is called paintingJobs.txt, each line is structured in this way:
Estimate Number, Estimate Date, Customer ID, Final Total, Status (E for Estimate, A for Accepted job or N for Not accepted), and Amount Paid.
Here is an extract:
E5341, 21/09/2015, C102, 440, E, 0
E5342, 21/09/2015, C103, 290, A, 290
E5343, 21/09/2015, C104, 730, N, 0
I would like the user to input any Estimate number and for that line to be outputted. How can I achieve this?
Here is what I came up with but it doesn't work as required:
def option_A():
es_num = str.upper (input ("Please enter the estimate number: "))
with open('paintingJobs.txt', 'r') as file:
line = file.readline ()
print (line, end = '')
if es_num in file:
#print whole line
else:
print("Not found")
I would like to display the information in this format
Estimate Number: the estimate number
Customer ID: the customer ID
Estimate Amount: the final total
Estimate Date: the estimate date
Status: the status
To print the line, I suggest you to simply iterate on each line of the file as follows:
def option_A():
es_num = str.upper (input ("Please enter the estimate number: "))
result = "Not found"
with open('paintingJobs.txt', 'r') as file:
for line in file:
if es_num in line:
result = line
break
print(result)
To format the display, you can split the line with comma as separator to get a list of information. Then format your display, as follows:
data = result.split(',')
print("Estimated number:{0}".format(data[0]))
print("Customer ID:{0}".format(data[2]))
...etc...
Then if you need some data which are more complex to retrieve from the text file, the powerful way is to use regex with for instance the method re.match(...).
I want to create a parser to a document very similar to the following samba configuration file. it has many sections, every section has a header line, which start with [ followed by a keyword section name, e.g. global, share_name, etc., till the end of line. followed the section header line is the parameters for this section. We don't know the end of a section till we reach the beginning of another section new line [.., how can I write a rule for this kind of doc? All antlr examples I found knows exactly when start a section and when to end a section. Thanks a lot!
[global]
netbios name = NETBIOS_NAME
workgroup = WORKGROUP
security = user
[SHARE_NAME]
comment = COMMENT
force create mode = 0770
locking = yes
[printers]
comment = COMMENT
path = /var/spool/samba
browseable = No
Here is my grammar:
grammar SambaConfiguration;
file : global_section
share_name_section
printer_section
EOF
;
global_section
: SECTION_TAG_START GLOBAL_SECTION_TAG (.)* SECTION_TAG_END NEW_LINE
(~SECTION_TAG_START (.)* NEW_LINE)*
;
share_name_section
: SECTION_TAG_START SHARE_NAME_SECTION_TAG (.)* SECTION_TAG_END NEW_LINE
((~SECTION_TAG_START) (.)* NEW_LINE)*
;
printer_section
: SECTION_TAG_START PRINTER_SECTION_TAG (.)* SECTION_TAG_END NEW_LINE
((~SECTION_TAG_START) (.)* NEW_LINE)*
;
SECTION_TAG_START
: '['
;
SECTION_TAG_END
: ']'
;
GLOBAL_SECTION_TAG
: 'global'
;
SHARE_NAME_SECTION_TAG
: 'SHARE_NAME'
;
PRINTER_SECTION_TAG
: 'printer'
;
NEW_LINE :
'\r' ? '\n' | '\r'
;
WHITE_SPACE
: ' ' | '\t'
;
Somehow, it does not work properly. When running in Antlrworks, it gives me the following exception:
problem matching token at 12:19 NoViableAltException('o'#[1:1: Tokens
: ( SECTION_TAG_START | SECTION_TAG_END | GLOBAL_SECTION_TAG |
SHARE_NAME_SECTION_TAG | PRINTER_SECTION_TAG | NEW_LINE | WHITE_SPACE
);])
Thanks.
The error message:
problem matching token at 12:19 NoViableAltException('o'#[1:1: Tokens : ( SECTION_TAG_START | SECTION_TAG_END | GLOBAL_SECTION_TAG | SHARE_NAME_SECTION_TAG | PRINTER_SECTION_TAG | NEW_LINE | WHITE_SPACE );])
means that ANTLR encounters a character, 'o', that it cannot create a token for. You probably think it will be matched by the . in your parser rules, but it doesn't. Inside parser rules, the . matches any token, while only inside lexer rules it matches any character.
Your lexer only creates the following tokens: SECTION_TAG_START, SECTION_TAG_END, GLOBAL_SECTION_TAG, SHARE_NAME_SECTION_TAG, PRINTER_SECTION_TAG, NEW_LINE and WHITE_SPACE. So a . inside a parser rule matches any of these tokens, nothing more.
Unless you're doing this to learn ANTLR, I'd hesitate to use ANTLR for this task. You can do this easier with some built-in string operations and reading the input line-by-line.
Using ANTLR, you could do something similar to this:
grammar T;
parse
: section* EOF
;
section
: header line*
;
header
: SECTION_TAG_START name=text SECTION_TAG_END NEW_LINE
{
System.out.println("name=" + $name.text);
}
;
line
: key=text ASSIGN value=text (NEW_LINE | EOF)
{
System.out.println(" key=`" + $key.text.trim() +
"`, value=`" + $value.text.trim() + "`");
}
;
text
: OTHER+
;
SECTION_TAG_START : '[';
SECTION_TAG_END : ']';
ASSIGN : '=';
NEW_LINE : '\r'? '\n';
OTHER : . /* any other char: must be the last rule! */;
Parsing your example input would print the following to your console:
name=global
key=`netbios name`, value=`NETBIOS_NAME`
key=`workgroup`, value=`WORKGROUP`
key=`security`, value=`user`
name=SHARE_NAME
key=`comment`, value=`COMMENT`
key=`force create mode`, value=`0770`
key=`locking`, value=`yes`
name=printers
key=`comment`, value=`COMMENT`
key=`path`, value=`/var/spool/samba`
key=`browseable`, value=`No`
So far I have this program doing what i want. However when running through it will overwrite the last employee record instead of just adding to the file. I'm new to prgramming and have been staring at this for hours and i can't get it yet. Just need a little nudge in the right direction.
# Define Employee Class
# Common Base Class for all Employees
class EmployeeClass:
def Employee(fullName, age, salary):
fullName = fullName
age = age
salary = salary
def displayEmployee():
print("\n")
print("Name: " + fullName)
print("Age: " + age)
print("Salary: " + salary)
print("\n")
EmployeeArray = []
Continue = True
print ("Employee Information V2.0")
while Continue == True:
print ("Welcome to Employee Information")
print ("1: Add New Record")
print ("2: List Records")
print ("3: Quit")
choice = input("Pick an option: ")
if choice == "1":
fullName = input ("Enter Full Name: ")
if fullName == "":
blankName = input ("Please enter a name or quit: ")
if blankName == "quit":
print ("Goodbye!")
print ("Hope to see you again.")
Continue = False
break
age = input ("Enter Age: ")
salary = input ("Enter Salary: ")
EmployeeRecords = open ('EmployeeRecords.txt' , 'w')
EmployeeRecords.write("Full Name: " + fullName + '\n')
EmployeeRecords.write("Age: " + age + '\n')
EmployeeRecords.write("Salary: " + salary + '\n')
EmployeeRecords.close()
elif choice == "2":
EmployeeRecords = open ('EmployeeRecords.txt', 'r')
data = EmployeeRecords.read()
print ("\n")
print (data)
EmployeeRecords.close
elif choice == "3":
answer = input ("Are you sure you want to quit? " "yes/no: ")
if answer == "yes" or "y":
print ("Bye!")
Continue = False
else:
Continue
else:
print ("Please choose a valid option")
print ("\n")
You are opening the file to be rewritten each time, based on the control string passed to open. Change open ('EmployeeRecords.txt, 'w')to open ('EmployeeRecords.txt', 'a+'). and the records will be appended to the end of the file.
Append mode should work.
EmployeeRecords = open('EmployeeRecords.txt', 'a')