import time
import timeit
import datetime

def concat1(n):
    start = time.time()
    time.sleep(0.02)
    s = "-".join(str(i) for i in range(n))
    end = time.time()
    return end-start

def concat2(n):
    start = timeit.default_timer()
    time.sleep(0.02)
    s = "-".join(str(i) for i in range(n))
    end = timeit.default_timer()
    return end-start

def concat3(n):
    start = datetime.datetime.now()
    time.sleep(0.02)
    s = "-".join(str(i) for i in range(n))
    end = datetime.datetime.now()
    return (end-start).total_seconds()

def concat4(n):
    start = time.process_time()
    time.sleep(0.02)
    s = "-".join(str(i) for i in range(n))
    end = time.process_time()
    return end-start

print(timeit.timeit('"-".join(str(i) for i in range(100000))',number=5))
print(concat1(100000))
print(concat2(100000))
print(concat3(100000))  
print(concat4(100000))

import numpy as np
x = np.arange(1,1000002,50000)
y1 = np.empty(len(x))
y2 = np.empty(len(x))
y3 = np.empty(len(x))
y4 = np.empty(len(x))
for j,xj in enumerate(x):
    y1[j] = concat1(xj)
    y2[j] = concat2(xj)
    y3[j] = concat3(xj)
    y4[j] = concat4(xj)
    print(j,xj,y1[j],y2[j],y3[j])

import matplotlib.pyplot as plt
plt.plot(x,y1,label='time.time()')
plt.plot(x,y2,label='timeit.default_timer()')
plt.plot(x,y3,label='datetime.datetime.now()')
plt.plot(x,y4,label='time.process_time()')
plt.legend()
plt.show()