As an example, it will be easier if you handle it by putting it back in the dictionary of "city = number".
Type (dictionary)-Python3

list = [(1,'Tokyo', 4), (3,'Tokyo', 6), (2,'Osaka', 9), (7,'Kobe', 10), (4,'Kobe', 8)]
#City name: Dictionary of numbers
cities = {}
for tv in list:
    k = tv [1]
    if k in cities:
        cities [k] + = 1
    else: else:
        cities [k] = 1
#Cities list can be obtained with cities.keys ().
#City
print ('names = {}'. format (','. join (cities.keys ())))
#Number of cities
for name in cities.keys ():
    print ('{} = {}'. format (name, cities [name]))

This is an execution example.

$python3 --version
Python 3.6.9
$python3 t1.py
names = Tokyo, Osaka, Kobe
Tokyo = 2
Osaka = 1
Kobe = 2