python基础篇-字符串和编码

字符串

print('包含中文的str')

print(ord('A'))
print(ord('中'))
print(chr(66))
print(chr(25991))
print('\u4e2d\u6587')
print('ABC'.encode('ascii'))
print('中文'.encode('utf-8'))
#print('中文'.encode('ascii'))

print(b'ABC'.decode('ascii'))
print(b'\xe4\xb8\xad\xe6\x96\x87'.decode('utf-8'))

print(b'\xe4\xb8\xad\xff'.decode('utf-8',errors='ignore'))
print(len('ABC'))
print(len('中文'))
print(len(b'ABC'))
print(len(b'\xe4\xb8\xad\xe6\x96\x87'))
print(len('中文'.encode('utf-8')))

#!/usr/bin/env python3
# _*_ coding: utf-8 _*_

格式化

print('Hello, %s' % 'world')
print('Hi, %s, you have $%d.' % ('Michael', 1000000))

# _*_ coding: utf-8 _*_
print('%2d-%02d' % (3, 1))
print('%.2f' % 3.1415926)

print('Age: %s. Gender: %s' % (25, True))

print('growth rate: %d %%' % 7)

format（）

print('Hello, {0}, 成绩提升了 {1:.1f}%'.format('小明', 17.125))

#小明的成绩从去年的72分提升到今年的85分，请计算小明成绩提升的百分点，并用字符串格式化显示出'xx.x%'，只保留小数点后1位：

s1 = 72
s2 = 85
r = (s2-s1)/s2*100
print('%.1f%%' % r)

print('中文'.encode('gb2312'))

# _*_ coding: utf-8 _*_

s = 'python-中文'
print(s)
b = s.encode('utf-8')
print(b)
print(b.decode('utf-8'))