Python函数使用的相关练习题分享

def func_sum(x, y):
return x + y
#或
lambda x,y:x+y

import os
def modify_file(file_name,content,newstr):
new_file_name = '%sfile_name' %'new.'
f_new = open(new_file_name, 'w')
if os.path.exists(file_name):
with open(file_name,'r+') as f:
for line in f:
if content in line:
line = line.replace(content, newstr)
f_new.write(line)
f_new.close()
os.rename(new_file_name, file_name)
else:
exit('file is not exist !!!')

def isNull(p_obj):
for item in p_obj:
if item.strip() == '':
return True
else:
return False
a = [' ','1','2']
b = ['5','1','2']
c = 'ab c'
print(isNull(a))
print(isNull(c))
print(isNull(b))

def two_len(**kwargs):
for k, v in kwargs.items():
if len(v) > 2:
kwargs[k] = v[:2]
return kwargs
print(two_len(x='12', y='345', c='byw'))

def cards():
type_li = ['红心', '草花', '黑桃','梅花']
num = list(range(2, 11))
num.extend('JQKA')
return [(x, y) for x in type_li for y in num ]
print(len(cards()), cards())

def max_min_dic(*args):
min_v = min(args)
max_v = max(args)
return {'max':max_v,'min':min_v}
print(max_min_dic(2,3,6,7,9))

from functools import reduce
def factorial(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return reduce(lambda x, y: x*y ,list(range(1, n)))
print(factorial(5))

user_dic={
'user':None,
'is_authenticate':False
}
def read_file():
with open('USER.TXT','r') as f:
s = f.read().strip(',')
user_info = eval(s)
return user_info
def auth(user_info):
username = input("account:").strip()
password = input("password:").strip()
print(user_info)
if username in user_info['name'] and password in user_info['password']:
print("success")
user_dic['user'] = username
user_dic['is_authenticate'] = True
return user_dic
else:
print("Failure")
return ''
def login_required(func):
def inner(*args, **kwargs):
if args[0].get('is_authenticate'):
ret = func(*args, **kwargs)
else:
exit('need authenticate')
return ret
return inner
@login_required
def print_info(acc_data):
print('进入')
user_info = read_file()
user_data = auth(user_info)
print(user_data)
print_info(user_data)