python 小练习1

_input = ['I',6,6,'love','python',6]

_str = ''
_sum = 0
for item in _input:
    if isinstance(item,str):
        _str += item
        _str += ' '
    elif isinstance(item,int):
        _sum += item
    else:
        print('nothing')

print(_str)
print(_sum)

实现输出2-3+4-5+6.....+100

_sum = 0
for item in range(2,101):
    if item % 2 == 0:
        _sum += item
    else:
        _sum -= item
    
print(_sum)

 使用while循环输入 1 2 3 4 5 6     8 9 10

i = 0

while i < 10:
    i += 1
    if i ==7:
        continue
    else:
        print(i)

 

#coding:gbk

f = open(r'C:UsersMartinDesktoppython_class_members.txt')

content = f.readlines()

while True:
    _input = input('pls input your choise:')
    if _input == 'all':
        for line in content:
            print(line)
    elif _input in ['quit','exit','q']:
        exit()
        
    elif "-" in _input:
        prefix,suffix = _input.split('-')
        for line in content[int(prefix) - 1:int(suffix)]:
            print(line)
    
    elif _input not in str(content):
        print('sorry, your input is not in search')
    
    
    else:
        for item in content:
            if _input in item:
                print(item)