Table of contents
a.1: Open the file stu_info.txt in writing mode and write (name-sex-age) to the file: each line
function that satisfies the meaning of the question
a. Write:
a.1: Open the file stu_info.txt in writing mode and write (name-sex-age) to the file: each line
use write
method one
list_data = [ "zhangsan-male-20",
"lisi-female-21",
"wangwu-male-20"
]
file_data = open("stu_info", "w", encoding='utf-8')
str_data = file_data.write("\n".join(list_data))
file_data.close()Method Two
list_data = [ "zhangsan-male-20",
"lisi-female-21",
"wangwu-male-20"
]
with open("stu_info", "w") as file_data:
print(file_data.write("\n".join(list_data)))
use writelines
method one
list_data = ["zhangsan-male-20\n","lisi-female-21\n","wangwu-male-20\n" ]
file_data2 = open("stu_info", "w")
str_data2 = file_data2.writelines(list_data)
file_data2.close()Method Two
list_data = ["zhangsan-male-20\n","lisi-female-21\n","wangwu-male-20\n" ]
with open("stu_info", "w") as file_data2:
print(file_data2.writelines(list_data))b. Read:
b. Read: Open the file stu_info.txt by reading, read each line of the file, and format the output, output format: center alignment
print(f"{'name':^20}{'gender':^10}{'age':^10}")
file_data = open("stu_info", "r")
str_data = file_data.readlines()
file_data.close()
# print(str_data, type(str_data))
for i in str_data:
strip_data = i.strip()
split_data = strip_data.split("-")
# print(split_data, type(split_data))
print(f"{split_data[0]:^20}{split_data[1]:^10}{split_data[2]:^10}")
'''
name gender age
zhangsan male 20
lisi female 21
wangwu male 20
'''
'''
decorator:
a. Decorator: It is required to define a decorator (general), which can print out the running time of the decorated function
function that satisfies the meaning of the question
import time
def decorator(arg):
def outer(func):
def inner(*args, **kwargs):
befor_time = time.time()
func(*args, **kwargs)
after_time = time.time()
run_time = befor_time - after_time
print(run_time)
return inner
return outer
@decorator("debug")prove
Decorate print hello
import time
def decorator(arg):
def outer(func):
def inner(*args, **kwargs):
befor_time = time.time()
func(*args, **kwargs)
after_time = time.time()
run_time = befor_time - after_time
print(run_time)
return inner
return outer
@decorator("debug")
def print_arg(*args, **kwargs):
time.sleep(2)
print("hello")
# print(key=1)
print_arg(1, 3, key=2)Decorate a function that takes keyword arguments
import time
def decorator(arg):
def outer(func):
def inner(*args, **kwargs):
befor_time = time.time()
func(*args, **kwargs)
after_time = time.time()
run_time = befor_time - after_time
print(run_time)
return inner
return outer
@decorator("debug")
def print_key(*, key="vaule"):
print(key)
time.sleep(2)
print_key(key=1)Decorate a function that can calculate and print the sum of three numbers
import time
def decorator(arg):
def outer(func):
def inner(*args, **kwargs):
befor_time = time.time()
func(*args, **kwargs)
after_time = time.time()
run_time = befor_time - after_time
print(run_time)
return inner
return outer
@decorator("debug")
def print_sum(arg1, arg2, arg3, arg4):
arg = arg1 + arg2 + arg3 + arg4
print(arg)
time.sleep(2)
print_sum(1, 2, 3, 4)