# 1 str.format() 示例
1)
print('{}网址： "{}!"'.format('Python技术', 'www.justdopython.com'))
2)
print('{0} 和 {1}'.format('Hello', 'Python'))

print('{0} {1}'.format('Hello', 'Python'))

print('{1} {0}'.format('Hello', 'Python'))
3)
print('{name}网址： {site}'.format(name='Python技术', site='www.justdopython.com'))
4)
print('电商网站 {0}, {1}, {other}。'.format('淘宝', '京东', other='拼多多'))
5)
"repr() shows quotes: {!a}; str() doesn't: {!s}".format('test1', 'test2')
6)
import math

print('The value of PI is approximately {0:.3f}.'.format(math.pi))
7)
table = {'Sjoerd': 123, 'Jack': 456, 'Dcab': 789}

for name, phone in table.items():print('{0:10} ==> {1:10d}'.format(name, phone))
8)
table = {'Sjoerd': 123, 'Jack': 456, 'Dcab': 789789789789}

print('Jack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; ' 'Dcab: {0[Dcab]:d}'.format(table))
table = {'Sjoerd': 123, 'Jack': 456, 'Dcab': 789789789789}

print('Jack: {Jack:d}; Sjoerd: {Sjoerd:d}; Dcab: {Dcab:d}'.format(**table))
2
str = input("请输入：");

print ("输入的内容是: ", str)
3
read()
f = open('tmp.txt', 'r')

str = f.read(5)

print(str)

f.close()
readline()
f = open('tmp.txt', 'r')

str = f.readline()

print(str)

f.close()
readlines()
f = open('tmp.txt', 'r')

str = f.readlines(1)

print(str)

f.close()
write()
f = open('tmp.txt', 'w')

num = f.write('Hello Python')

print(num)

f.close()
seek()
f = open('tmp.txt', 'rb+')

f.write(b'0123456789abcdef')
移动到文件的第 6 个字节
f.seek(5)

print(f.read())
tell()
f = open('tmp.txt', 'r')

f.seek(5)

print(f.tell())
close()
with open('tmp.txt', 'r') as f:

read_data = f.read()

print(f.closed)
with 使用
with open('tmp.txt', 'r') as f:

read_data = f.read()

print(f.closed)
json 操作
import json

data = {'id':'1', 'name':'jhon', 'age':12}

with open('t.json', 'w') as f:

json.dump(data, f)

with open("t.json", 'r') as f:

d = json.load( f)

print(d)