Python基础语法（一）

print('hello world')
print("您好，Python")

# 变量赋值
counter = 100;  # 赋值整型变量
miles = 1000.0  # 浮点型
name = "JoyTan" # 字符串

print(counter)
print(miles)
print(name)

# 多个变量赋值
a = b = c = 1
a,b,c = 1,2,"JoyTna"

print("a=",a)
print("b=",b)
print("c=",c)

if a == b:
print("1")
else:
print("0")

var = 100;

if(var == 100 ) : print("变量 var 的值为 100")

print("Good bye！")

# while循环
print("循环开始")
count = 0
while count < 9 :
print("The Count is", count)
count = count + 1

print("循环结束")

# continue
i = 1
while i < 10 :
i += 1
if i%2 > 0 :    # 非双数时跳出循环
continue
print(i)        # 输出双数 2、4、6、8、10
print("continue")

# break
i = 1
while 1:           # 循环条件为1 必定成立
print(i)        # 输出 1 - 10
i += 1
if i > 10 :     # 当 i 大于 10 时跳出循坏
break
print("break")

# 无限循环
'''
var = 1
while var == 1 :
num = input("输入一个数字：")
print("您输入的数字是：", num)

print("无限循环")
'''
# 循环使用 else 语句
count = 0
while count < 5 :
print(count)
count = count + 1
else:
print("大于5",count)

print("for 循环")
for letter in "Python" :
print("当前字母：", letter)

fruits = ["banana","apple","mango"]
for fruit in fruits :
print("当前字母：", fruit)

print("for 循环")

# 使用else语句
for num in range(10,20):
for i in range(2,num):
if num%i == 0:
j = num/i
print("%d 等于 %d * %d" % (num,i,j))
break
else:
print(num,"是一个质数")

var1 = "Hello World!"
var2 = "Python Programming"

print("var1[0]",var1[0])
print("var2[1:5]：",var2[1:5])
print("Updated String :-",var1[:6]+"Python")