python_test_0528

python_test_0528

print("pp49_0528")
print(str(10000))
'''
字符串方法
'''
#find
str1 = "with a moo-moo"
pos = str1.find("moo")
print("number"+repr(8))
#print("index is" + str(pos))
#异常信息提示 'str' object is not callable 表示您正在尝试将字符串对象作为函数进行调用，但实际上字符串不是可调用的（即不是函数）
#单个纯数字转字符串用str,也可以用repr
#str是字符串转换函数，不要拿来当变量用--------------
#print(str(10000))
print(str(10000))
#字符串连接，数字与字符串相加则用repr,repr已合法的python表达式的形式来表示值
str2 = ("index is" + repr(pos))
print("index is " + str(pos)) #p21
title2 = "mononday is first day on xx on"
value2 = title2.find("on")
print("index is " + str(value2))
value2 = title2.find("kk")
print("未找到返回值： " + str(value2))
print("长度： " + str(len(title2)))
value2 = title2.find("on",27)
print("从索引27位置查找on结果:" + str(value2))
start_index  = 1
end_index = 5
value2 = title2.find("on",start_index,end_index)
print("设置起始位置的结果："+ str(value2))
#join方法
seq = ['1', '2']
seq_plus = '_'

str3 ="abcdefg"
symbol3 = "_"
ret3 = [symbol3.join(str3)] #连接方式1
print(ret3)
ret5 = [symbol3.join(seq)] #连接方式2
print(ret5)
'''
Traceback (most recent call last):
  File "D:/Users/tangxianwu/PycharmProjects/python_server_test/test0528.py", line 34, in <module>
    seq_plus.join(seq) ,类型相同才能相连接
TypeError: sequence item 0: expected str instance, int found
'''
#所有字母变小写
str5 = "Tangxx"
print(str5.lower())
#替换 replace
str6 = "this is a test"
print(str6.replace("is","good"))
#分割split
str7 = "aa_bb_cc_dd_ee"
print(str7.split('_'))
#去除前后空格strip,c# 是trim函数
str8 = " trewq "
print(str8.strip())
#指定需要去除的字符空格
str9 ="*** spam * everyone! ***"
print(str9.strip(" *!"))
#3.4.7 translate替换单个字符
#from string import maketrans #ImportError: cannot import name 'maketrans' from 'string',py3.8不支持，py2.7可以
#table2= maketrans('cs','kz')
#print(len(table2))
#table2[97:123]
#maketrans('','')[97:123]
print("P54")

 

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