(i) Python simple application

After self-study, the paper solves several simple problems by using cyclic statements and judgment statements:

1, the realization of 1 to 10 and:

x = 1he = 0while x < one:    if x = = 7:        pass    else:        he = he + x    x = x + 1print (HE)

2, the realization of 1 to 100 and:

X=1he =0while x< 101:    he=x+he    x=x+1print (He)

3, achieve 100 even add:

x = 1while x < 101:    if x% 2 = = 0:        print (x)    else:        pass    x = x + 1

4, achieve the odd sum within 100:

x = 1while x < 101:    if x% 2 = = 0:        pass    else:        print (x)    x = x + 1

5, the realization of seeking 1-2+3-4+5 ... 99 of all numbers of the and:

x = 1he = 00while x <:    if x% 2 = = 0:        he = He-x    else:        he = he + x    x = x + 1print (HE)

6. Achieve three landing attempts:

Pure If statement version:

Idcard = 123passward = 123x = 0a = input ("Please enter your account") c = input ("Please enter your password") if a = = Idcard and c = = Passward:    print ("Login Successful") else:    print ("Login failed")    a = input ("Please enter your account")    c = input ("Please enter your password")    if a = = Idcard and c = = Passward:        prin T ("login successfully")    else:        print ("Login failed")        a = input ("Please enter your account")        c = input ("Please enter your password")        if a = = Idcard and c = = Passward:            print ("Successful login")        else:            print ("Three login failed, forced exit")

To add a while loop version:

idcared= 123passward = 123x = 0while x < 3:    a = input ("Please enter your account")    c = input ("Please enter your password")    if a = = Idcard and C = = Passward:        print ("login successfully")    else:        print ("Login failed Please reenter")        if x==2:            print ("Input three times failed, force exit")        x = x + 1

　　

A simple attempt to pass through these questions summarizes 1, often forgetting to add a loop-limiting variable. 2, do not pay attention to the amount of indentation in the code.

(i) Python simple application