First create a new file ty.txt, Write the following in it ：

Line 1
Line 2
Line 3

Create a new one under the same directory Python file , open .

Read the file

Use open Method to open a file ：

open(r".\ty.txt","r")

open The first argument to the function is the file name , The second is the opening method . Because I want to read the file , So choose "r" Pattern .

There are still some parameters that we haven't filled in ： This will be answered in detail later .

After opening, you need to read the content .

1）read()

a=open(r".\ty.txt","r").read()
print(a)

Output ：

Line 1
Line 2
Line 3

read Function provides a int Type parameter , Indicates the number of read characters （ Default = all ）. example ：

a=open(r".\ty.txt","r").read(1)
print(a)

Output ：

L

2）readline()

a=open(r".\ty.txt","r")

Create a file object .

t1=a.readline()
t2=a.readline()
t3=a.readline()
print(t1)
print(t2)
print(t3)

result ：

Line 1
Line 2
Line 3

There are more line breaks because readline A newline character is returned at the end of the line , add print The line break that comes with it , One more. .

readline There is a function with read Parameters with the same function . See above .

notes ： If it were readline once , That is, it exceeds the total number of rows , The return value is null .

3）readlines()

a=open(r".\ty.txt","r")
t1=a.readlines()
print(t1)

Return value ：

['Line 1\n', 'Line 2\n', 'Line 3']

Returns... As a string list .

There is a parameter ：hint.

hint Usage of parameters

About python in readlines() Function hint Use of parameters _ Running caterpillar blog -CSDN Blog _python readlines Parameters Use readlines()： Used to read multiple lines of data from a file or stream at once , The returned data is stored in a list . The basic format for reading file contents is ： File object .readlines(hint) for example ：fname=open("《 Chengdu 》 The lyrics .txt","rt",encoding="utf-8") Then there are ：fname.readlines(hint) among hint The value of is troublesome , Look up a lot of information on the Internet , A lot of people went into the pit , Finally, I summed it up by myself ：...https://blog.csdn.net/cicisensy/article/details/105755245【 I won't , See the above great God blog】

attach ： Different forms of reading

1)

text=open("...","r").read()

2)

a=open("...","r")
text=a.read()

3)

with open("...","r") as a:
text=a.read()

4)

a=open("...","r")
text=""""""
for i in a.readlines():
text=text+i

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