for 循环：
for 循环用于迭代序列（即列表、元组、字典、集合或字符串）。
语法：
对于序列中的变量
示例：
txt = ‘1234’for num in txt: print(num,end=’ ‘)output:1 2 3 4
如果条件：
if 语句的工作原理是检查表达式以查看是否满足条件，并根据获得的输出返回一个值。
syntax:if condition:if condition is trueelse:if condition is false
示例
x=20if x>=20: print(x is within 20)else : print(x is above the limit)output:x is within 20
txt = ’12a4’for num in txt: if num>=’0′ and num<=’9′: print(num,end=’ ‘) else: print(‘not decimal’,end=’ ‘)output:1 2 not decimal 4above code is the example of bines if and for.
name = input(“请输入您的名字：”)
打印（姓名）
名称中的字母：
print(字母表, end=’*’)
输出：
r*a*j*a
代码检查每个索引并打印输出。
name1 = input("Enter the first name: ")name2 = input("Enter the second name: ")name3 = input("Enter the third name: ")name4 = input("Enter the fourth name: ")name = [name1, name2, name3, name4]for letter in name: if letter[0]==’G’: print(letter) else: continuefor alphabet in name: if alphabet[-1]==’a’: print(alphabet) else: continuefor alpha in name: for i in alpha: if i==’ ‘:print(alpha) else:continuefor character in name: if len(character)>9: print(character) else: continueoutput:Enter the first name: GuhanrajaEnter the second name: Lakshmi PrithaEnter the third name: Guru PrasannaEnter the fourth name: VaratharajanGuhanrajaGuru PrasannaGuhanrajaLakshmi PrithaGuru PrasannaLakshmi PrithaGuru PrasannaLakshmi PrithaGuru PrasannaVaratharajan
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