How to get emails received from gmail python?

I just want to get the received emails in gmail with python, currently I have this code but only get limited number of emails: also I just want the 10 last emails and I just don't understand how to use pop3.

Source of the code: https://www.code-learner.com/python-use-pop3-to-read-email-example/

import poplib
import smtplib, ssl
def guess_charset(msg):
    # get charset from message object.
    charset = msg.get_charset()
    # if can not get charset
    if charset is None:
       # get message header content-type value and retrieve the charset from the value.
       content_type = msg.get('Content-Type', '').lower()
       pos = content_type.find('charset=')
       if pos >= 0:
          charset = content_type[pos + 8:].strip()
    return charset

def decode_str(s):
    value, charset = decode_header(s)[0]
    if charset:
       value = value.decode(charset)
    return value
# variable indent_number is used to decide number of indent of each level in the mail multiple bory part.
def print_info(msg, indent_number=0):
    if indent_number == 0:
       # loop to retrieve from, to, subject from email header.
       for header in ['From', 'To', 'Subject']:
           # get header value
           value = msg.get(header, '')
           if value:
              # for subject header.
              if header=='Subject':
                 # decode the subject value
                 value = decode_str(value)
              # for from and to header. 
              else:
                 # parse email address
                 hdr, addr = parseaddr(value)
                 # decode the name value.
                 name = decode_str(hdr)
                 value = u'%s <%s>' % (name, addr)
           print('%s%s: %s' % ('' * indent_number, header, value))
    # if message has multiple part. 
    if (msg.is_multipart()):
       # get multiple parts from message body.
       parts = msg.get_payload()
       # loop for each part
       for n, part in enumerate(parts):
           print('%spart %s' % ('' * indent_number, n))
           print('%s--------------------' % ('' * indent_number))
           # print multiple part information by invoke print_info function recursively.
           print_info(part, indent_number + 1)
    # if not multiple part. 
    else:
        # get message content mime type
        content_type = msg.get_content_type() 
        # if plain text or html content type.
        if content_type=='text/plain' or content_type=='text/html':
           # get email content
           content = msg.get_payload(decode=True)
           # get content string charset
           charset = guess_charset(msg)
           # decode the content with charset if provided.
           if charset:
              content = content.decode(charset)
           print('%sText: %s' % ('' * indent_number, content + '...'))
        else:
           print('%sAttachment: %s' % ('' * indent_number, content_type))

# input email address, password and pop3 server domain or ip address
email = 'yourgmail@gmail.com'
password = 'yourpassword'

# connect to pop3 server:
server = poplib.POP3_SSL('pop.gmail.com')
# open debug switch to print debug information between client and pop3 server.
server.set_debuglevel(1)
# get pop3 server welcome message.
pop3_server_welcome_msg = server.getwelcome().decode('utf-8')
# print out the pop3 server welcome message.
print(server.getwelcome().decode('utf-8'))

# user account authentication
server.user(email)
server.pass_(password)

# stat() function return email count and occupied disk size
print('Messages: %s. Size: %s' % server.stat())
# list() function return all email list
resp, mails, octets = server.list()
print(mails)

# retrieve the newest email index number
#index = len(mails)
index = 3
# server.retr function can get the contents of the email with index variable value index number.
resp, lines, octets = server.retr(index)

# lines stores each line of the original text of the message
# so that you can get the original text of the entire message use the join function and lines variable. 
msg_content = b'\r\n'.join(lines).decode('utf-8')
# now parse out the email object.

from email.parser import Parser
from email.header import decode_header
from email.utils import parseaddr

import poplib

# parse the email content to a message object.
msg = Parser().parsestr(msg_content)
print(len(msg_content))
# get email from, to, subject attribute value.
email_from = msg.get('From')
email_to = msg.get('To')
email_subject = msg.get('Subject')
print('From ' + email_from)
print('To ' + email_to)
print('Subject ' + email_subject)
for part in msg.walk():
    if part.get_content_type():
        body = part.get_payload(decode=True)
        print_info(msg, len(msg))


# delete the email from pop3 server directly by email index.
# server.dele(index)
# close pop3 server connection.
server.quit()

I also tried this code but it didn't work:

import imaplib, email, base64


def fetch_messages(username, password):
    messages = []
    conn = imaplib.IMAP4_SSL("imap.gmail.com", 993)
    conn.login(username, password)
    conn.select()
    typ, data = conn.uid('search', None, 'ALL')

    for num in data[0].split():
        typ, msg_data = conn.uid('fetch', num, '(RFC822)')
        for response_part in msg_data:
            if isinstance(response_part, tuple):
                messages.append(email.message_from_string(response_part[1]))
        typ, response = conn.store(num, '+FLAGS', r'(\Seen)')
    return messages

and this that also didn't work for me...

import poplib
from email import parser
pop_conn = poplib.POP3_SSL('pop.gmail.com')
pop_conn.user('@gmail.com')
pop_conn.pass_('password')

messages = [pop_conn.retr(i) for i in range(1, len(pop_conn.list()[1]) + 1)]
# Concat message pieces:
messages = ["\n".join(mssg[1]) for mssg in messages]
#Parse message intom an email object:
messages = [parser.Parser().parsestr(mssg) for mssg in messages]
for message in messages:
    print(message['subject'])
    print(message['body'])