python 语言基础1（自学）2022.3.6

1. Hello World

2.字符串（String）

3.数字（number）

4.注释（marking）

5.禅（import）

Python基本语法（Python 编程从入门到实践 第二章）

11：30

1.文件“Hello World”

print ("你好，世界")

print("Hello Python world!")

message="Hello python world!"

print(message)

 output

你好，世界
Hello Python world!
Hello python world!

 2.文件“String”

message='This is a string'

message2="This is a string"

name="yuchiYixuan yuchi"

print(name.title())#所有的首字母大写

print(name.upper())#所有的字母大写

print(name.lower())#所有的字母小写

surname="yuchi"

firstname="yixuan"

fullname=surname+" "+firstname

print(surname+firstname)#用加号进行字符串合并

print(surname+" "+firstname)

print(fullname)

a="Python"

b="C"

c="java "

print("t"+a+"t")#t制表符，缩进

print("Language:n"+a+"n"+b+"n"+c)#n制表符，换行

print("Language:nt"+a+"nt"+b+"nt"+c)

print(c+b)

print(c.rstrip()+b)#删除空白

sentence="I don't like you"#若外引号改成单引号会报错

 output

Yuchiyixuan Yuchi
YUCHIYIXUAN YUCHI
yuchiyixuan yuchi
yuchiyixuan
yuchi yixuan
yuchi yixuan
    Python    
Language:
Python
C
java 
Language:
    Python
    C
    java 
java C
javaC

3.文件“Number" 

print(2+3)

print(3-2)

print(2*3)

print(3/2)

print(2+3*4)

print((2+3)*4)

print(0.1+0.1)

print(2*0.2)

print(0.1+0.2)

age=23

message="Happy "+str(age)+"rd Birthday"#In Python, the type of data should be the same, use str() to transform the number to string

print(message)

output

5
1
6
1.5
14
20
0.2
0.4
0.30000000000000004
Happy 23rd Birthday

文件"Marking&import" 

 

import pandas as pd

import this

#Hi Python(单行注释）
'''
hfjahjd
sdsdsff
dsfsdfsdf
fds
'''#多行注释
print("hello world")

print(pd.read_csv)

print(this)

 output

 

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
hello world

认真理解，python的禅，对以后编程有很大好处