Python: simple statements

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if else select statement:

 if guess == 8:            #要加冒号，不用括号，依然是==赋值
        print("你他妈真是我儿子。")            #不用加大括号，Python使用缩进区分代码块
        print("牛逼。")
elif guess==7 or guess== 9:      #多个条件分支用的是elif
        print("很接近了！！")
else:                           #依然要加冒号
        print("不对。")
print("结束了儿子。")           #这个语句是程序跳出if else语句后统一打印的

Print statements (string):

print("Hello world!")
print("water"+"river")       #拼接字符串
print("ha"*8)        #打印指定次数字符串

The default is to print print line, the end of the wrap plus end = '', instead of the transport means is a space

Enter the statement:

input ( ""): python the built-in functions, quotes print content requires typing a character string.

loop statement:

while：

    while 条件 ：
    		statement

for:
Use in conjunction with range ().

for i in range(1,10):                   #结果是1 2 3 4 5 6 7 8 9
    print(i,end=' ')

Affirm:

assert condition

In general we can assert in the inspection point in the program, when the need to ensure that programs a condition must be true in order for the program to work, then, assert is very useful.
If the condition is false, it throws an exception of AssertionError.
[There is no training program to assert related, and other research after I studied grammar and precautions in this section plus]