str1 = 'I love GDUT choir'
print(str1[:6])
print(str1[2])
print(str1[:10] + ' insert' + str1[5:]);
str2 = 'xiaoxie'
print(str2)
print(str2.capitalize())
print('---------------------------')
str3 = 'DAXIExiaoxie'
print(str3)
print(str3.casefold())
print('---------------------------')
print(str2.endswith('xi'))
print(str2.endswith('xie'))
str4 = 'I\tlove\tFishC.com!'
print(str4.expandtabs())
print(str4.find('efc'))
print(str4.find('com'))
str5 = '张胜男'
print(str5.islower())
print(str4.islower())
str6 = ' i mai li su'
print(str3.islower())
print(str6.partition('ai'))
print('\tt')