python3中join和格式化的用法小结

str1 = "hello"
print(list(str1))

['h', 'e', 'l', 'l', 'o']

list01 = ['h', 'e', 'l']
print("".join(list01))

hel

list1 = ['a', 'b', 'c','d','e']
print(' '.join(list1))
print('#'.join(list1))
print('-'.join(list1))

a b c d e
a#b#c#d#e
a-b-c-d-e

name = "mily"
print("hello %s"%name)

hello mily

name = "mily"
age = 18
print("hello %s, 今年%s岁"%(name, age))

hello mily, 今年18岁

name = "mily"
age = 18
print("姓名：{}，年龄：{}".format(name, age)) 

姓名：mily，年龄：18

name = "mily"
age = 18
print("年龄：{1}，姓名：{0}".format(name, age))

年龄：18，姓名：mily

print("姓名：{name},年龄：{age}".format(name="mike", age=10))

姓名：mike,年龄：10

print("12.1234保留2位小数后为{:.2f}".format(12.1234))

12.1234保留2位小数后为12.12

print("8的二进制为等于：{:b}".format(8))

8的二进制为等于：1000

print("8的八进制为等于：{:o}".format(8))

8的八进制为等于：10

print("10的十六进制为等于：{:X}".format(10))

10的十六进制为等于：A

print("{:*^20}".format("mily"))

********mily********

language = ["python","Java","GO"]
print("我想学{}, {}, {} 编程语言".format(*language))

我想学python, Java, GO 编程语言

language = ["python","Java","GO"]
print("我想学{2}, {0}, {1} 编程语言".format(*language))

我想学GO, python, Java 编程语言

dict01 = {"name": "mikeChen", "age": "20"}
print("姓名：{name}, 年龄：{age}".format(**dict01))

姓名：mikeChen, 年龄：20

name = "mily"
age = 10
print(f"name is {name}, age is {age}")

name is mily, age is 10

dict01 = {"name": "mikeChen", "age": "20"}
print(f"name is {dict01.get('name')}, age is {dict01.get('age')}")

name is mikeChen, age is 20

print(f"The total calculate is {8*9 + 10-3}")```

```python
The total calculate is 79

name = "MILY"
print(f"lower name is {name.lower()}")

lower name is mily