Source code for python_lib_examples.built_in_list_dict_str

def list_basics():
    # basic list in Python
    arr = []
    for i in range(10):
        arr.append(i)
    print(f"arr:{arr}")
    arr = sorted(arr, reverse=True)
    print(f"arr:{arr}")
    arr.sort()
    print(f"arr:{arr}")

    arr.pop()
    print(f"arr:{arr}")

    arr.extend([11, 12])
    print(f"arr:{arr}")

    # Questions
    # is arr.remove('abc') O(n) ?
    # is arr.pop(0) O(1) ?
    # is list double sided list?

    res = zip([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])
    for i in res:
        print(f"i:{i}")

    for i in enumerate(["a", "b", "c", "d", "e"]):
        print(f"i:{i}")





def dict_basics():
    d = {}
    for i in range(10):
        d[i] = str(i)

    for k, v in d.items():
        print(f"k:{k}, v:{v}")
    d[8] = "80"
    print(f"d[8]:{d[8]}")
    d.pop(9)
    print(d)
    print(d.keys())
    print(d.values())





def calculators():  # Q: what is the precise name?
    a0 = 123 & 456
    a1 = 123 | 456
    a2 = 123 ^ 456
    a3 = 123**456
    a4 = 123 % 456
    a5 = 123 / 456
    a6 = 123 // 456
    a = [a0, a1, a2, a3, a4, a5, a6]
    print(f"a:{a}")





def str_basics():
    s = "abc"
    s += "def"
    print(f"s:{s}")
    print("a" in s)
    print("ab" in s)
    s2 = ".".join(["a", "b", "c"])
    print(f"s2:{s2}")

    s3 = "this is an apple."
    print(s3.split(" "))
    print(s3.startswith("t"))
    s4 = s3.replace("th", "ht")
    print(f"s4:{s4}")
    print(s4.capitalize())
    print(s4.lower())
    print(s4.count("s"))
    print(s4.upper())
    print(s4.isalpha())
    print(s4.isspace())
    print(s4.strip())



if __name__ == "__main__":
    # benefit of if __name__ == '__main__':
    # this section won't run if basics.py is imported as a module and not run
    # as main program.

    # list_basics()
    # dict_basics()
    # calculators()
    str_basics()