Python編程從入門到實踐筆記——變量和簡單數據類型

#coding=gbk
#變量
message_1 = ‘aAa fff‘
message_2 = ‘hart‘
message_3 = "Albert Einstein once said, “A person who never made a mistake never tried anything new.”"

#使用方法修改字符串的大小寫
print(message_1.title())
print(message_1.upper())
print(message_1.lower())

#字符串拼接
print(message_1+"
 
 "+message_2)

#使用制表符或換行符來添加空白
print("\tPython")
print("Python\nJava\nJavaScript")

#刪除空白
#刪除字符串末尾空白rstrip()
#刪除字符串開頭的空白lstrip()
#刪除字符串兩端的空白strip(),效果等於Java中的trim()
favorite_language=‘\tpython  ‘
print("My favorite language is "+favorite_language.rstrip()+".")
print("My favorite language is "+favorite_language.lstrip()+"
 
.")
print("My favorite language is "+favorite_language.strip()+".")

#字符串替換
a=‘Hello World‘
b=a.replace(‘World‘,‘Python‘)

#整數
num=23
print(num)

#**表示乘方運算
print(num**2)

#浮點數
num_1=0.1
print(num_1*2)

#使用str()避免類型錯誤
print(str(23)+"james")

Python編程從入門到實踐筆記——變量和簡單數據類型