简明python教程实例

《简明python教程》是名副其实最合适的入门教程，跟着英文原版的改进，中文译本同时也有了新的版本，适合python3，python3和python2语法上有一些差距，这里总结一些python3的应用实例，一是总结学习，二是方便查找基础知识。

1.print打印

print('Hello World!')

print("Hello World!")

2.'''或'''指定多行字符串
m_str='''这是一段多行字符串，这是第一行
this is the second line.
"wha's your name?," Iasked.
He said "Bond, James Bond".
'''
print(m_str)3.格式化输出
name = 'python'
age = 20
print('name = {0}, age = {1}'.format(name,age))
print("name = %s, age = %d" %(name,age))

print(name + ' is ' + str(age) + ' years old')

4.用end指定print的打印结尾，默认是\n

print('a', end="")
print("b", end="")

print('c', end = ' ')
print('d', end = ' ')

5. \ 显式行连接
s = 'This is a string \
this continues the string'

print(s)6.表达式（print打印的逗号,必须要，否则提示语法错误，同时会自动添加空格调整显示结果，不需要添加最后的空格）

length = 5
breadth = 2

area = length*breadth
print('Area is', area)
print('Perimeter is', 2*(length + breadth))

7.if语句

number = 23
guess = int(input('Enter an integer : '))

if guess == number:
#新块从这里开始
print('Congratulations, you guessed it.')
elif guess < number:
print('No, it is a little higher than that.')
else:
print('No, it is a little lower than that.')

print('Done')

8.while语句
number = 23
running = True

while running:
guess = int(input('Enter an integer : '))

if guess == number:
#新块从这里开始
print('Congratulations, you guessed it.')
#这将导致while循环中止
running = False
elif guess < number:
print('No, it is a little higher than that.')
else:
print('No, it is a little lower than that.')
else:
print('The while loop is over.')

print('Done')9.for语句

for i in range(1, 5):
print(i)
else:
print('the for loop is over')

10.break语句
while True:
s = input('Enter something : ')
if s == 'quit':
break
print('Length of the string is', len(s))
print("Done")
11.continue语句

while True:
s = input('Enter something : ')
if s == 'quit':
break
if len(s) < 3:
print('too small')
continue
print('Length of the string is', len(s))
print("Done")

12.函数一（简单定义）

def say_hello():
#函数块
print('Hello World')

say_hello()
13.函数二（带参数的函数）

def print_max(a, b):
if a > b:
print(a, 'is maximum')
elif a == b:
print(a, 'is equal to', b)
else:
print(b, 'is maximumu')

print_max(3, 4)

14.局部变量

x = 50

def func(x):
print('x is', x)
x = 2
print('changed local x to', x)

func(x)
print('x is still', x)

15.global全局变量（不推荐这么做）
x = 50

def func():
global x
print('x is', x)
x = 2
print('changed local x to', x)

func()
print('value of x is', x)16.函数三（带默认参数的函数）
def say(message, times = 1):
print(message * times)

say('Hello')
say('World', 3)17.函数四（关键字参数）
def func(a, b=5, c=10):
print('a is', a, 'and b is', b, 'and c is', c)

func(3, 7)
func(25, c = 24)
func(c= 50, a =100)18.可变参数
def total(a=5, *numbers, **phonebook):
print('a', a)

#遍历元组中左右项目
for single_item in numbers:
print('single_item', single_item)

#遍历字典中的所有项目
for first_part, second_part in phonebook.items():
print(first_part, second_part)

print(total(10,1,2,3,Jack=1123,John=2231,Inge=1234))当我们声明一个诸如*param的星号参数时，从此处开始直到结束的所有位置参数都将被收集并汇集成一个称为"param"的元组。
类似地，当我们声明一个诸如**param的双星号参数时，从此处开始直到结束的所有关键字参数都将被收集汇集到一个名为param的字典。

19.return语句
def maximum(x, y):
if x > y:
return x
elif x == y:
return 'The numbers are equal'
else:
return y

print(maximum(2, 3))

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