Do not add any imports, the ones that you need will be given to you.Do not use try-except statements, you should be able to anticipateor prevent any errors from happening at all! def find enail(s: str) -> str:Given a string , return the emoil that exists in the string.Preconditions: contains at most 1 emoil, or none ot oll.If cs> does not contain on email, return the empty string.Email definition:An emoil oddress is defined os 'nomeadomain.com' or 'nane@domoin.co'with the following specifications:name: the nome is on olphanuneric string that is less than orequol to 12 charocters. Additional charocters ollowed aredash (-), period (.) and underscore (). But the emoilLcannot start or end with these odditional characters.The name must olso be ot least 1 character Long.Example names:obo_bA_B..C--DInt3ršst. Ingdomain: the domain is strictly numericol, and the number must bedivisible by 5. the Length of the domain is unrestricted.Example donains:984125ending: the email must end with a (.com) or (.ca) (cose sensitive)Note: you mUst not use any Loops (for, while) here.We want you to just use the re Library for this function.d_emoil('12345o_test_email@165265365. com!')'a_test_email@l165265365. comreg = "([a-zA-ZB-91{1}[a-zA-Z0-9+_.J{1,11})@([0-9]+) [5][.J([a-zA-Z]+)"m = re.search(reg, s)if (m == None):mail =else:mail - n.group()return mail def test_template (f: Callable) -> None:This is a template for the tests you will write for this lab.Implement your tests as top level functions that begin with theword 'test' and take in a callable function .You are free to do some amount of work to construct your tests caseswithin the function but your function must end with an assert statementof the form .An assert statement means that you expect the boolean expression followingto evaluate to True. With regards to this lab, it means that you expect thefunction call on the left to return the string on the right. If this doesnot happen, then the assert statement will raise an AssertionError, whichwe will catch and take it to mean that this particular test failed.IMPORTANT:The goal of this part of the lab is to write a set of tests such that thatALL of them pass for any correct implementation, but AT LEAST ONE of themfail for any incorrect implementation (of "find_email").assert f('test@0.com')'test@0.com'==

I def find enail(s: str) -> str: Given a string , return the enail thot exists in the string. Preconditions: es> contoins at most 1 email, or none ot oll. If cs> does not contain on enail, return the enpty string. Emoil definition: An enail oddress is defined os 'none@donain.com' or 'nane@donain.co with the folloning specifications: name: the nome is an olphonumeric string that is less than or equol to 12 chorocters. Additionol charocters ollowed ore dosh (-), period (.) and underscore ). But the email connot stort or end with these odditional charocters. The none must olso be ot least 1 charocter Long. Example names: ab 0_b AB..C--D Int3r3st. Ing domain: the domain is strictly nunericol, and the number must be divisible by 5. the Length of the donain is unrestricted. Exomple domains: 984125 ending: the enail must end with a (.com) or (.co) (cose sensitive) Note: you mUst not use ony Loops (for, while) here. We want you to just use the re Library for this function. >> find enail('123450_test_enaila165265365.com!) 'a_test enoil@165265365. com reg = "(la-zA-Z0-]{1}[a-zA-ZB-0.J(1,11})@C[0-91+)[5]L.J(la-zA-Z]+)"

I def find enail(s: str) -> str: Given a string , return the enail thot exists in the string. Preconditions: es> contoins at most 1 email, or none ot oll. If cs> does not contain on enail, return the enpty string. Emoil definition: An enail oddress is defined os 'none@donain.com' or 'nane@donain.co with the folloning specifications: name: the nome is an olphonumeric string that is less than or equol to 12 chorocters. Additionol charocters ollowed ore dosh (-), period (.) and underscore ). But the email connot stort or end with these odditional charocters. The none must olso be ot least 1 charocter Long. Example names: ab 0_b AB..C--D Int3r3st. Ing domain: the domain is strictly nunericol, and the number must be divisible by 5. the Length of the donain is unrestricted. Exomple domains: 984125 ending: the enail must end with a (.com) or (.co) (cose sensitive) Note: you mUst not use ony Loops (for, while) here. We want you to just use the re Library for this function. >> find enail('123450_test_enaila165265365.com!) 'a_test enoil@165265365. com reg = "(la-zA-Z0-]{1}[a-zA-ZB-0.J(1,11})@C[0-91+)[5]L.J(la-zA-Z]+)"

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Do not add any imports, the ones that you need will be given to you.
Do not use try-except statements, you should be able to anticipate
or prevent any errors from happening at all!

def find enail(s: str) -> str:
Given a string <s>, return the emoil that exists in the string.
Preconditions:
<s> contains at most 1 emoil, or none ot oll.
If cs> does not contain on email, return the empty string.
Email definition:
An emoil oddress is defined os 'nomeadomain.com' or 'nane@domoin.co'
with the following specifications:
name: the nome is on olphanuneric string that is less than or
equol to 12 charocters. Additional charocters ollowed are
dash (-), period (.) and underscore (). But the emoilL
cannot start or end with these odditional characters.
The name must olso be ot least 1 character Long.
Example names:
ob
o_b
A_B..C--D
Int3ršst. Ing
domain: the domain is strictly numericol, and the number must be
divisible by 5. the Length of the domain is unrestricted.
Example donains:
984125
ending: the email must end with a (.com) or (.ca) (cose sensitive)
Note: you mUst not use any Loops (for, while) here.
We want you to just use the re Library for this function.
d_emoil('12345o_test_email@165265365. com!')
'a_test_email@l165265365. com
reg = "([a-zA-ZB-91{1}[a-zA-Z0-9+_.J{1,11})@([0-9]+) [5][.J([a-zA-Z]+)"
m = re.search(reg, s)
if (m == None):
mail =
else:
mail - n.group()
return mail

def test_template (f: Callable) -> None:
This is a template for the tests you will write for this lab.
Implement your tests as top level functions that begin with the
word 'test' and take in a callable function <f>.
You are free to do some amount of work to construct your tests cases
within the function but your function must end with an assert statement
of the form <assert f('string') == 'some string'>.
An assert statement means that you expect the boolean expression following
to evaluate to True. With regards to this lab, it means that you expect the
function call on the left to return the string on the right. If this does
not happen, then the assert statement will raise an AssertionError, which
we will catch and take it to mean that this particular test failed.
IMPORTANT:
The goal of this part of the lab is to write a set of tests such that that
ALL of them pass for any correct implementation, but AT LEAST ONE of them
fail for any incorrect implementation (of "find_email").
assert f('test@0.com')
'test@0.com'
==

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