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Python Day 字符串函数、循环、ifelse 条件和任务


查找():
字符串中搜索指定值并返回找到它的位置。
例如:

txt = "hello, welcome to my world."  x = txt.find("welcome")  print(x)  

输出:

7  

因此 welcome 根据索引位于第七位。如果给出任何其他未定义的单词,则结果将为 -1

注意:在上面的例子中,如果使用索引函数而不是find,那么它将显示“valueerror:子字符串未找到”。如果定义,则输出将与find函数相同。

循环
for循环
例如:1

txt = '1234'  for num in txt:     print(num,end=' ')  

输出:

1 2 3 4 

例如:2

name = input("enter name: ") print(name) for alphabet in name:     print(alphabet, end='*')  

输出:

enter name: guru guru g*u*r*u* 

如果:
它根据语句的真假来决定运行程序。

Python Day 字符串函数、循环、ifelse 条件和任务
例如:

txt = '12a4'  for num in txt:     if num>='0' and num<='9':         print(num,end=' ')     else:         print('not decimal',end=' ')  

输出:

1 2 not decimal 4  

在上面的示例中,1,2,4 是十进制,但 a 不是小数,因此在输出中,根据其他条件,它显示的不是十进制。

任务:

拉克希米·普里塔
大师 prasanna
古汉拉贾
瓦拉塔拉扬

查找:
1: 以字母“g”开头的名字
2:名称以“a”结尾
3:名称之间有空格
4:名字超过9个字母

name=input("enter names: ") names=(name).split(",")  for letter in names:     if letter.startswith('g'):         print("names starts with g are: ",letter)     else :         letter.endswith('a')         print("names end with a are: ",letter) for space in names:     for word in space:         if word==' ':             print("names with space: ",space)         else:             continue for character in names:     if len(character)>9:         print("names with more than 9 letters: ",character) 

输出:

Enter names: guru prasanna,guhanraja,lakshmi pritha,varatharajan Names starts with g are:  guru prasanna Names starts with g are:  guhanraja Names end with a are:  lakshmi pritha Names end with a are:  varatharajan Names with space:  guru prasanna Names with space:  lakshmi pritha Names with more than 9 letters:  guru prasanna Names with more than 9 letters:  lakshmi pritha Names with more than 9 letters:  varatharajan   

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