相同点：均可接纳一个变量用以限定每一次读取的信息量 ，但一般 不应用
区别：
read() 【即 fileObject().read( [size] ) 】
特性：读取全部文件 ，将文件內容放到一个字符串数组变量中 。
缺点：假如文件十分大，特别是在超过运行内存时 ，没法应用read()方式 。
with open(r'../learn_file/file_to_read.txt', encoding='utf-8', mode='r') as fb:
content = fb.read()
print(type(content))
print(content)
# 輸出：
#
# line 1: Hello, Mike.
# line 2: Nice to meet you. I'm Nick.
# line 3: Welcome to Shenzhen.
# line 4: Thx, it is really a beautiful city. I enjoy my time here.
# line 5: It is. Shall we go for some coffee this afternoon.
# line 6：Sure. And I want to discuss some details about the project we're going to work for
readline() 【即 fileObject.readline( [size] ) ，[size]表明可选主要参数。】
特性：从文件中一行一行地整行读取数据信息，假如特定了一个非负数的主要参数 ，则回到特定尺寸的字节 。
缺陷：比readlines()慢得多
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with open(r'../learn_file/file_to_read.txt', encoding='UTF-8', mode='r ') as fb:
while True:
content = fb.readline().replace('\n', '')
# content = fb.readlines()
# if not content:
# break
if content:
print(type(content), content)
else:
break
# print(type(content))
# print(type(content), content)
print(fb.name)
# 輸出：
# line 1: Hello, Mike.
# line 2: Nice to meet you. I'm Nick.
# line 3: Welcome to Shenzhen.
# line 4: Thx, it is really a beautiful city. I enjoy my time here.
# line 5: It is. Shall we go for some coffee this afternoon.
# line 6：Sure. And I want to discuss some details about the project we're going to work for.
# ../learn_file/file_to_read.txt
readlines() 【即 fileObject.readlines( [sizeint] ) ，[sizeint] 表明可选主要参数】
特性：从文件一次读取全部行并返回列表，若给出sizeint > 0 ，回到总数大概为sizeint字节数的行
with open(r'../learn_file/file_to_read.txt', encoding='utf-8', mode='r') as fb:
content = fb.readlines()
print(type(content))
for line in content:
print(type(line), line.replace('\n', ''))
# 輸出
#
# line 1: Hello, Mike.
# line 2: Nice to meet you. I'm Nick.
# line 3: Welcome to Shenzhen.
# line 4: Thx, it is really a beautiful city. I enjoy my time here.
# line 5: It is. Shall we go for some coffee this afternoon.
# line 6：Sure. And I want to discuss some details about the project we're going to work for.
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