我先用in来做一次

def find_text(text_input1, text_input2):
    a = str(text_input1)
    b = str(text_input2)

    if b in a:
        print(f"The {b} is in {a} ")
    else:
        print(f"The {b} is not in {a} ")


text_n1 = "Welcome to shenyang"
text_n2 = "to"

find_text(text_n1, text_n2)

使用find

def find_text(text_input1, text_input2):
    a = str(text_input1)
    b = str(text_input2)

    if a.find(b) != -1:
        print(f"The {b} is in {a} ")
    else:
        print(f"The {b} is not in {a} ")


text_n1 = "Welcome to shenyang"
text_n2 = "to"

find_text(text_n1, text_n2)