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关于python:Kangrui‘s-Python-Learning-Diary-20200727

jiezi

学习了对于文件解决以及代码测试的内容
以下所用文件能够在“图灵社区”收费下载

文件解决局部

# 建设相对路径的办法如下：# file_path = 'C:\Users\other_files\text_files\filename.txt'
# with open(file_path) as file_object
with open('text_file\pi_digits.txt') as file_object:  # 传递绝对路径
    contents = file_object.read()
    print(contents)
    # 文末会有 1 个空行，因为 read()达到文件开端时返回一个空字符串
    print(contents.rstrip())

# 逐行读取
filename = 'text_file\pi_digits.txt'
with open(filename) as file_object:
    for line in file_object:
        print(line)

with open(filename) as file_object:
    lines = file_object.readlines()  # 读取每一行并存在一个列表中
for line in lines:
    print(line.rstrip())

pi_string = ''
for line in lines:
    pi_string += line.rstrip()

print(pi_string)  # 右边也有空格
print(len(pi_string))

pi_string = ''
for line in lines:
    pi_string += line.strip()

print(pi_string)
print(len(pi_string))

输入后果为：
3.1415926535
8979323846
2643383279

3.1415926535
8979323846
2643383279
3.1415926535

8979323846

2643383279

3.1415926535
8979323846
2643383279
3.1415926535 8979323846 2643383279
36
3.141592653589793238462643383279
32

检测生日是否在圆周率前百万位
这部分有须要输出的内容，故不展现输入

filename = 'text_file\pi_million_digits.txt'
with open(filename) as file_object:
    lines = file_object.readlines()  # 读取每一行并存在一个列表中

pi_string = ''
for line in lines:
    pi_string += line.strip()

print(pi_string[:52] + "...")
print(len(pi_string))

birthday = input("Enter your birthday, in the form mmddyy:")
if birthday in pi_string:
    print("Your birthday appears in the first million digits of pi!")
else:
    print("Failed.")

文件写入及读取局部

# 写入空文件
filename = 'programming.txt'
with open(filename,'w') as file_object:
    # 以写入的形式关上文件，若无文件将创立文件
    file_object.write("I love programming.\n")
    file_object.write("I love creating new games.\n")
    # 每次输出都会笼罩本来的内容

# 以追加的形式关上
with open(filename,'a') as file_object:
    file_object.write("I love finding meaning in large database.\n")
    file_object.write("I love creating apps that run in a browser.\n")

# 应用 try-except 代码块解决异样
try:
    print(5/0)
except ZeroDivisionError:
    print("You can't divide by zero!")
    # 并非真正的解决，而是以不报错的形式持续运行

while True:
    first_num = input("\nFirst number:")
    if first_num == 'q':
        break
    second_num = input("\nSecond number:")
    try:
        answer = int(first_num)/int(second_num)
    except ZeroDivisionError:
        print("You can't divide by zero!")
    else:
        print(answer)

# 失败时一声不吭：应用 pass 命令

# 应用 json 模块存储数据
import json

numbers = [2,3,5,7,11,13]
filename = 'number.json'
with open(filename,'w') as f_obj:
    json.dump(numbers,f_obj)

with open(filename) as f_obj:
     new_numbers = json.load(f_obj)

print(new_numbers)

函数测试局部

def get_formatted_name(first, last, middle=''):
    if middle:
        full_name = first + '' + middle +' ' +last
    else:
        full_name = first + ' ' +last
    return full_name.title()

class NamesCase(unittest.TestCase):
    def test_first_last_name(self):
        formatted_name = get_formatted_name('janis', 'joplin')
        self.assertEqual(formatted_name, 'Janis Joplin')

    def test_first_middle_last_name(self):
        formatted_name = get_formatted_name('janis', 'joplin', 'stupid')
        self.assertEqual(formatted_name, 'Janis Stupid Joplin')

# 各种断言形式
    # assertEqual
    # assertNotEqual
    # assertTrue: 判断是否为真
    # assertFalse
    # assertIn: 判断是否在列表中
    # assertNotIn

# 办法 setup()
    # 用以创立一个考察对象，一个答案列表
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