1.数据类型
list 列表[1,2,3]
tuple 元组(1,2,3)
dict 字典{"key1":"value1", "key2":"value2"}
2.字符串类型转换
a = "哈哈".decode("utf-8")
3.字符串拼接,%s 字符串的占位符,%d 数值的占位符
a = "my name is %s dulianyong" % "world's"
print a 输入结果my name is world's dulianyong
a = "this is {} {}".format("my", "borther")
a = "this is {0} {1}".format("my", "apple")
a = "this is {ss} {kk}".format(ss = "my", kk"apple" = "apple")
a = "this is %(w)s %(t)s" % {"w":"my", "t":"apple"}
4.字符串拼接join
a = "a"
b = "sssssssssss"
c = "151sfsdfsdf"
"".join([a,b,c])
'asssssssssss151sfsdfsdf'
",".join([a,b,c])
'a,sssssssssss,151sfsdfsdf'
5.读写文件
w:write;r:read;a:append
写:
d = open("a.txt", "w")
d.write("hi. second hi.")
d.close()
读:
d = open("a.txt", "r")
d.readline()//读取一行
d.read(10)//读取十行
d.seek(0)//游标回到第一行
import linecache 使用linecache读取文件,返回的是元组
print linecache.getline("a.txt", 1)
print linecache.getlines("a.txt")