SyntaxError和＆＃34; if未定义＆＃34;

Question

我不知道自己做错了什么。该计划正在显示："syntax error"和"if is not defined"。

task = input (' select task 1, 2 or  3. Type  5 to exit\n')


If (task == 1 ) : 
    print "I am task 1! \n"
    print "I can tell you the sum of two numbers. \n"
    n = input ('input the first number \n')
    m = input ('input the second number \n')
    sum = n + m 
    print " their sum is : ", sum, ".\n"

Answer 1

因为If（task == 1）：

你必须写＆＃34;如果＆＃34;不是＆＃34;如果＆＃34;。大写字母＆＃34;如果＆＃34;必须小写

task = input (' select task 1, 2 or  3. Type  5 to exit\n')


if task == 1: 
    print "I am task 1! \n"
    print "I can tell you the sum of two numbers. \n"
    n = input ('input the first number \n')
    m = input ('input the second number \n')
    sum = n + m 
    print " their sum is : ", sum, ".\n"

这将有效。