Count number of occurrences of a I have in string Python

Method 1 - 

s = "a wedef aa c"
s.count('a')

Method 2 - 

s = "a wedef aa c"
sum([1 for _ in s if _ == 'a' ])

Method 3 - 

s = "a wedef aa c"
c = 0
for i in s:
    if i=='a':
        c+=1
print c

Execution time test

import timeit


def count_method_1():
    s = "a wedef aa c"
    return s.count('a')


def count_method_2():
    s = "a wedef aa c"
    return sum([1 for _ in s if _ == 'a'])


def count_method_3():
    s = "a wedef aa c"
    c = 0
    for i in s:
        if i == 'a':
            c += 1
    return c


def main():
    time = timeit.repeat(lambda: count_method_1())
    print("Method 1 time - ", time)
    time = timeit.repeat(lambda: count_method_2())
    print("Method 2 time - ", time)
    time = timeit.repeat(lambda: count_method_3())
    print("Method 3 time - ", time)


if __name__ == "__main__":
    main()

Result

Method 1 time -  [0.3184861, 0.29942139999999995, 0.28848870000000004, 0.28497740000000016, 0.29332040000000004]
Method 2 time -  [0.8437245, 0.8938065000000002, 0.8882654999999997, 0.9092678000000003, 0.8961607000000003]
Method 3 time -  [0.6849796000000001, 0.6760326000000001, 0.6770035000000005, 0.7099235999999998, 0.6783089999999987]

Method 1 (s.count('a')) is the fastest.