1. io

• 24.8.29 11:05 created

1.1. file.read()

再当前py文件目录下，准备myfile.txt：

hello, how are you today?
I'm fine, thank you

读文件内容：

file = open("myFile.txt")
"""
hello, how are you today?
I'm fine, thank you
"""
print(file.read())

读文件前5个字符：

file = open("myFile.txt")
print(file.read(5))  # hello

读文件前5个字符后，再读5个字符

file = open("myFile.txt")
print(file.read(5))  # hello
print(file.read(5))  # , how

不能连续使用read()，第二次使用无法读取：

file = open("myFile.txt")
print(file.read())

print(file.read())

重置read的位置：

"""
hello, how are you today?
I'm fine, thank you

hello, how are you today?
I'm fine, thank you
"""
file = open("myFile.txt")
print(file.read())
file.seek(0)
print(file.read())

read返回的类型是string：

file = open("myFile.txt")
# file.read() returns a string
print(type(file.read()))  # <class 'str'>