Compare timings of joining a list of strings vs adding strings onto strings

string_list_join.py

import random
import string
import time

values = []
for i in range(10):
    values.append("".join(random.choices(string.ascii_letters + string.digits, k=10)))

n = 500000
print(f"Construct {n=} strings with these random values: {values=}")
print("---")

begin_dict = time.time_ns()
for i in range(n):
    string_to_add_to = ""
    for value in values:
        string_to_add_to += value
string_add_timing = time.time_ns() - begin_dict


begin_dict = time.time_ns()
for i in range(n):
    list_to_join = []
    for value in values:
        list_to_join.append(value)
    "".join(list_to_join)
list_join_timing = time.time_ns() - begin_dict

print(f"{'string add:':>20} {string_add_timing / 10 ** 6:.1f}ms")
print(f"{'list join:':>20} {list_join_timing / 10 ** 6:.1f}ms")
percentage_difference = (string_add_timing - list_join_timing) / list_join_timing * 100
print("---")
print(f"list join is {percentage_difference:.2f}% faster")

Construct n=500000 strings with these random values: values=['fqyShRulwa', '5b9ZpxDlA0', 'dyjzPbZXHy', 'Chb1SDhiR5', 'Wu0ZzFPM4V', 'eRkIjWwFYC', 'EDfP0bVVrV', 'nxoMjNmwkI', 'Le5bDVdnoh', 'txYXjdnpF0']
---
         string add: 441.2ms
          list join: 355.2ms
---
list join is 24.21% faster