print(‘hello word’)
hello word
内置对象类型：
整数（int）、浮点数（float），字符串（str），列表、元组、字典、集合
不能单独定义变量
round(0.123456,5)
0.12346
import math
print(“hellow word”)
import sys
b=sys.getdefaultencoding()
print(b)
print(“hellow word”)
a=“python”
type(a)
print(type(a))
m=“python”
n=“book”
print(m+n)
print(m3)
print(len(m3),‘p’ in m)
r=“python book”
print(r[-1],r[1: 9],“切片”,)
print(r[:9:2])
name=input("your name: ")
age=input("your age: ")
after=int(age)+10
print(“your name is :”,name)
print(“after ten years, you are”,after)
s=“python”
s
‘python’
s.index(‘n’)
5
s="python lesson’
File “”, line 1
s=“python lesson’
^
SyntaxError: EOL while scanning string literal
s=“python lesson”
s.index(‘n’,6)
12
s.index(‘on’)
4
a=“I LOVE PYTHON”
a.split(” “)
[‘I’, ‘LOVE’, ‘PYTHON’]
lst=a.split(” ")
lst
[‘I’, ‘LOVE’, ‘PYTHON’]
“-”.join(lst)
‘I-LOVE-PYTHON’
"I like {0} and {1}"format(“python”,“book”)
File “”, line 1
"I like {0} and {1}"format(“python”,“book”)
^
SyntaxError: invalid syntax
“I like {0} and {1}”.format(“python”,“book”)
‘I like python and book’
“I like {0:10} and {1:>15}”.format(“python”,“book”)
‘I like python and book’
“I like {0:^10} and {1:>15}”.format(“python”,“book”)
‘I like python and book’
“she is {0:4d} years old and {1:.1f}m in height”.format(28,1.68)
‘she is 28 years old and 1.7m in height’
