you are working as a freelancer. A company approached you and asked to create an algorithm for username validation. The company said that the username is string S .You have to determine of the username is valid according to the following rules.
1.The length of the username should be between 4 and 25 character [inclusive].
2.Valid username must start with a letter.
3 Valid username can only contain letters, numbers, and underscores characters.
4 Valid username cannot ends with the underscore character and also doesn't accept the special characters.
INPUT: The first line contains an integer T representing the number of test cases.
The first line of each test cases input contains a string.
OUTPUT: Each test case gives a Boolean value as output[true or false]
sample Input:
3
Google_123
google@123
sampleOutput
true
true
false
sample input 2
HelloPython
#Coder
CoderIt
sampleoutput 2
true
false
true
validation:
username should be in between 4 and 25
should start with letters but not underscore
should not be special characters
input:
output:
true
input:
google@123
output:
false
import string
def validate[name]:
if len[name] < 4 or len[name] > 25:
return False
if name[0] not in string.ascii_letters:
return False
for ch in name:
if [ch not in string.ascii_letters and
ch not in string.digits and ch != '_']:
return False
return True
def main[]:
name = input[]
if validate[name]:
print['true']
else:
print['false']
if __name__ == '__main__':
main[]Learn more about our help with Assignments: Python
We are given a string, we need to check whether the string is a valid username or not. To be a valid username, the string should satisfy the following conditions:
def check_username[s]:
alphabets = list['abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ']
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
if [type[s[0]] != str]:
return 'Invalid Username1'
if [len[s]25]:
return 'Invalid Username3'
if [s[-1] == '_']:
return 'Invalid Username4'
for i in s:
if [i in alphabets] or [i == '_'] or [i in numbers]:
continue
return 'Invalid Username5'
return 'Valid Username'
t = int[input['Enter number of test cases: ']]
for i in range[t]:
s = input['\nEnter username: ']
s = list[s]
for i in range[len[s]]:
try:
s[i] = int[s[i]]
except:
continue
print[check_username[s], '\n'] so i have this data validation program which validated the name, email and age but its giving me an error
def emailcheck[]:
if [email[0] == "@"]:
print["email not valid try again"]
email = input["enter email:"]
if ["@" not in email]:
print["your email is not valid"]
email = input["enter email:"]
if [email == ""]:
print["email is empty"]
email = input["enter email:"]
def namecheck[]:
if [name == ""]:
print["name is empty"]
name = input["enter name:"]
def agecheck[]:
if [age != int]:
print["age must be a number"]
age = input["enter your age:"]
if [age != range[1,120]]:
print["i dont even know what to say"]
age = input["enter your age:"]
while True:
email = input["enter email:"]
emailcheck[]
name = input["enter name:"]
namecheck[]
age = input["enter your age:"]
agecheck[]
heres the error:
Traceback [most recent call last]: File "python", line 29, in File "python", line 2, in emailcheck UnboundLocalError: local variable 'email' referenced before assignment
i need this solved please
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